Inter-AS Option-C with RR
This sub-option enables VPNv4 routes exchange between the Route-Reflectors of different AS'es and thus requires
1. Remote PE loopback addresses to be known in the AS - This is accomplished using BGP-LU and is advertised inside the AS using the Route-reflector and outside the AS using the eBGP Peering between the ASBRs.
2. MP-eBGP peering between the two RRs of different AS'es in order to exchange VPNv4 routes.
3. To be able to have an eBGP session between RR's, Remote Route-reflector Loopback addresses are required to be known in the local AS and vice-versa. This is accomplished using the mutual redistribution between OSPF and bgp on the two ASBRs. The redistribution is controlled using the route-maps and only permits the
1. Local Route-reflectors Loopback address to be redistributed from local OSPF to BGP.
2. Remote Route-reflectors Loopback address to be redistributed from bgp to local OSPF.
4. Next-hop attribute should not be changed when RR reflects the VPNv4 route from iBGP peering to the remote RR over an eBGP peering. This is accomplished using the configuration "attribute-unchanged next-hop" for the eBGP neighbor.
5. Next-hop attribute should be changed when ASBR advertises the remote PE's Loopback address as LU route to the RR. This is accomplished using the configuration "next-hop self" for the iBGP RR neighbor
(1) and (5) enables an end to end LSP between the two PE's which needs to run the L3VPN service and (2), (3) and (4) enables the RR's to form BGP neighborship with each other and successfully exchange the VPNv4 Routes.
Topology
Figure 32-10: InterAS-VPN Option-C with RR
PE1
PE1(#configure terminal | Enter configure mode. |
PE1(config-router)#interface lo | Enter interface mode. |
PE1(config-if)# ip address 41.41.41.41/32 secondary | Assign the IPv4 address. |
PE1(config-if)#exit | Exit interface mode. |
PE1(config)#ip vrf vrf1 | Create a new VRF named vrf1. |
PE1(config-vrf)# rd 1:1 | Assign the route distinguisher (RD) value as 1:1. |
PE1(config-vrf)# route-target both 1:1 | Configure import and export route-target values |
PE1(config-vrf)#exit | Exit VRF mode. |
PE1(config-if)#interface xe23 | Enter interface mode. |
PE1(config-if)# ip vrf forwarding vrf1 | Bind the interface connected to the CE router with VRF vrf1. |
PE1(config-if)# ip address 10.1.1.2/24 | Assign the IPv4 address. |
PE1(config-if)#exit | Exit interface mode. |
PE1(config-if)#interface xe15 | Enter interface mode. |
PE1(config-if)# ip address 11.1.1.2/24 | Assign the IPv4 address. |
PE1(config-if)#exit | Exit interface mode. |
PE1(config-if)#router ospf 1 | Enter router OSPF mode. |
PE1(config-router)# ospf router-id 41.41.41.41 | Configure OSPF router id same as loopback ip address. |
PE1(config-router)# network 11.1.1.0/24 area 0.0.0.0 | Define the network on which OSPF runs and associate area id. |
PE1(config-router)# network 41.41.41.41/32 area 0.0.0.0 | Define the network on which OSPF runs and associate area id. |
PE1(config)#router ldp | Enter router LDP mode. |
PE1(config-router)#router-id 41.41.41.41 | Set the router ID to IP address 41.41.41.41 |
PE1(config-router)#transport-address ipv4 41.41.41.41 | Configure LDP transport address same as loopback address. |
PE1(config-router)#exit | Exit LDP mode. |
PE1(config-if)#interface xe15 | Enter interface mode. |
PE1(config-if)# label-switching | Enable label switching in interface. |
PE1(config-if)# enable-ldp ipv4 | Enable LDP in interface. |
PE1(config-if)#exit | Exit interface mode. |
PE1(config-router)#router bgp 65000 | Enter BGP router mode. |
PE1(config-router)# bgp router-id 41.41.41.41 | Configure BGP router-id. |
PE1(config-router)# no bgp default ipv4-unicast | Configure BGP peer to have no ipv4 unicast capability exchange by default. |
PE1(config-router)# neighbor 31.31.31.31 remote-as 65000 | Configure neighbor with remote AS. |
PE1(config-router)# neighbor 31.31.31.31 update-source lo | Update the loopback as the source of BGP session. |
PE1(config-router)# allocate-label all | Allocate the label for all advertised networks. |
PE1(config-router)# address-family ipv4 labeled-unicast | Enter the IPv4 labeled-unicast address family |
PE1(config-router-af)# neighbor 31.31.31.31 activate | Activate the neighbor under the address-family. |
PE1(config-router-af)# exit-address-family | Exit IPv4 labeled-unicast Address Family mode. |
PE1(config-router)# address-family vpnv4 unicast | Enter vpnv4 unicast address-family mode. |
PE1(config-router-af)# neighbor 31.31.31.31 activate | Activate the neighbor under vpnv4 unicast address-family. |
PE1(config-router-af)# exit-address-family | Exit vpnv4 unicast address-family. |
PE1(config-router)# address-family ipv4 vrf vrf1 | Enter ipv4 VRF address-family mode. |
PE1(config-router-af)# redistribute connected | Redistribute connected networks under VRF address-family. |
PE1(config-router-af)# exit-address-family | Exit ipv4 VRF address-family. |
PE1(config-router)#exit | Exit the router mode. |
PE1(config)#commit | Commit candidate configuration to be running configuration. |
PE1(config)#exit | Exit the config mode. |
P1
P1(config)#interface lo | Enter interface mode. |
P1(config-if)# ip address 51.51.51.51/32 secondary | Assign the secondary IPv4 address on loopback interface. |
P1(config-if)#interface xe15 | Enter interface mode. |
P1(config-if)# ip address 11.1.1.31/24 | Assign the IPv4 address. |
P1(config-if)#interface xe21 | Enter interface mode. |
P1(config-if)# ip address 12.1.1.31/24 | Assign the IPv4 address. |
P1(config-if)#interface xe22 | Enter interface mode. |
P1(config-if)# ip address 13.1.1.1/24 | Assign the IPv4 address. |
P1(config-if)#router ospf 1 | Enter router OSPF mode. |
P1(config-router)# ospf router-id 51.51.51.51 | Configure OSPF router-id (optional). |
P1(config-router)# network 11.1.1.0/24 area 0.0.0.0 | Enable networks for OSPF protocol. |
P1(config-router)# network 12.1.1.0/24 area 0.0.0.0 | Enable networks for OSPF protocol. |
P1(config-router)# network 13.1.1.0/24 area 0.0.0.0 | Enable networks for OSPF protocol. |
P1(config-router)# network 51.51.51.51/32 area 0.0.0.0 | Enable networks for OSPF protocol. |
P1(config-router)#router ldp | Enter router LDP mode. This is required to enable LDP globally on the router. |
P1(config-router)#router-id 51.51.51.51 | Set the router ID to IP address 51.51.51.51 |
P1(config-router)#transport-address ipv4 51.51.51.51 | Configure LDP transport address same as loopback address. |
P1(config-router)#interface xe15 | Enter interface configuration mode. |
P1(config-if)# label-switching | Configure label-switching on the interface. |
P1(config-if)# enable-ldp ipv4 | Enable LDP on the interface. |
P1(config-if)#interface xe21 | Enter interface configuration mode. |
P1(config-if)# label-switching | Configure label-switching on the interface. |
P1(config-if)# enable-ldp ipv4 | Enable LDP on the interface. |
P1(config-if)#exit | Exit interface mode. |
P1(config)#commit | Commit candidate configuration to the running configuration. |
P1(config)#exit | Exit the config mode. |
RR1
#configure terminal | Enter configure mode. |
RR1(config)#interface lo | Enter interface mode. |
RR1(config-if)# ip address 31.31.31.31/32 secondary | Assign the IPv4 address. |
RR1(config-if)#interface xe22 | Exit interface mode. |
RR1(config-if)# ip address 13.1.1.2/24 | Assign the IPv4 address. |
RR1(config-if)#router ospf 1 | Enter router OSPF mode. |
RR1(config-router)# ospf router-id 31.31.31.31 | Configure OSPF router-id explicitly (optional). |
RR1(config-router)# network 13.1.1.0/24 area 0.0.0.0 | Enable networks for OSPF protocol under area 0. |
RR1(config-router)# network 31.31.31.31/32 area 0.0.0.0 | Enable networks for OSPF protocol under area 0. |
RR1(config-router)#router bgp 65000 | Enter BGP router mode. |
RR1(config-router)# bgp router-id 31.31.31.31 | Configure BGP router-id. |
RR1(config-router)# no bgp default ipv4-unicast | Disable default ipv4-unicast capability exchange with BGP neighbors. |
RR1(config-router)# no bgp inbound-route-filter | Disable inbound route-filtering for bgp VPNV4 routes. This is required for Route-reflectors. |
RR1(config-router)# neighbor 2.2.2.2 remote-as 65000 | Configure PE2-ASBR as iBGP neighbor. |
RR1(config-router)# neighbor 2.2.2.2 update-source lo | Configure BGP speaker to use loopback address as source for BGP session. |
RR1(config-router)# neighbor 5.5.5.5 remote-as 65001 | Configure RR2 as an eBGP neighbor. |
RR1(config-router)# neighbor 5.5.5.5 ebgp-multihop | Enable multihop on eBGP session. |
RR1(config-router)# neighbor 5.5.5.5 update-source lo | Configure BGP speaker to use loopback address as source for this BGP session. |
RR1(config-router)# neighbor 41.41.41.41 remote-as 65000 | Configure PE1 as an iBGP neighbor. |
RR1(config-router)# neighbor 41.41.41.41 update-source lo | Configure BGP speaker to use loopback address as source for this BGP session. |
RR1(config-router)# allocate-label all | Configure this peer to allocate label for all advertised networks. |
RR1(config-router)# address-family ipv4 labeled-unicast | Enter ipv4 labeled-unicast address-family. |
RR1(config-router-af)# neighbor 2.2.2.2 activate | Activate PE2-ASBR for this AFI/SAFI. |
RR1(config-router-af)# neighbor 2.2.2.2 route-reflector-client | Configure PE2-ASBR as Route-reflector client. |
RR1(config-router-af)# neighbor 41.41.41.41 activate | Activate PE1 for this AFI/SAFI. |
RR1(config-router-af)# neighbor 41.41.41.41 route-reflector-client | Configure PE1 as Route-reflector client. |
RR1(config-router-af)# exit-address-family | Exit ipv4 labeled-unicast address-family. |
RR1(config-router)# address-family vpnv4 unicast | Enter vpnv4 unicast address-family. |
RR1(config-router-af)# neighbor 5.5.5.5 allow-ebgp-vpn | Allow eBGP VPN route exchange for the RR2 eBGP neighbor. |
RR1(config-router-af)# neighbor 5.5.5.5 activate | Activate the RR2 eBGP neighbor. |
RR1(config-router-af)# neighbor 5.5.5.5 attribute-unchanged next-hop | Configure next-hop unchanged for this eBGP neighbor for all vpnv4 NLRIs to keep original next-hop while advertising to this eBGP neighbor. |
RR1(config-router-af)# neighbor 41.41.41.41 activate | Activate PE1 iBGP neighbor. |
RR1(config-router-af)# neighbor 41.41.41.41 route-reflector-client | Configure PE1 as Route-reflector client for this AFI/SAFI. |
RR1(config-router-af)# exit-address-family | Exit Address-family mode. |
RR1(config-router)#exit | Exit the router mode. |
RR1(config)#commit | Commit candidate configuration to be running configuration. |
RR1(config)#exit | Exit the config mode. |
PE2-ASBR
PE2-ASBR#configure terminal | Enter configure mode. |
PE2-ASBR(config)#interface lo | Enter interface mode. |
PE2-ASBR(config-if)# ip address 2.2.2.2/32 secondary | Assign a secondary IPv4 address to the loopbacl interface. |
PE2-ASBR(config-if)#interface xe20 | Enter interface mode. |
PE2-ASBR(config-if)# ip address 12.1.1.2/24 | Assign an IPv4 address to the interface. |
PE2-ASBR(config-if)#interface xe5 | Enter interface mode. |
PE2-ASBR(config-if)# ip address 20.1.1.2/24 | Assign an IPv4 address to the interface. |
PE2-ASBR(config-if)#ip access-list standard RR1_LO | Create an IP standard access list to permit RR1s loopbacl address. This is required to redistribute RR1 Lo from OSPF to BGP. |
PE2-ASBR(config-ip-acl-std)# permit host 31.31.31.31 | Permit RR1 loopback address. |
PE2-ASBR(config-ip-acl-std)#ip access-list standard RR2_LO | Create an IP standard access list to permit RR2 Lo address. This is required to redistribute RR2 Lo from BGP to OSPF. |
PE2-ASBR(config-ip-acl-std)# permit host 5.5.5.5 | Permit RR2s Loopback address. |
PE2-ASBR(config-ip-acl-std)#route-map RR1_LO permit 10 | Create a Route-map to allow RR1-LO address . This is required when redistributing from OSPF to BGP. |
PE2-ASBR(config-route-map)# match ip address RR1_LO | match the RR1_LO access list. |
PE2-ASBR(config-route-map)#route-map RR2_LO permit 10 | Create a Route-map to allow RR2-LO address . This is required when redistributing from BGP to OSPF. |
PE2-ASBR(config-route-map)# match ip address RR2_LO | match the RR2_LO access list. |
PE2-ASBR(config-route-map)#router ospf 1 | Enter router OSPF mode. |
PE2-ASBR(config-router)# ospf router-id 2.2.2.2 | Configure OSPF router-id explicitly (optional). |
PE2-ASBR(config-router)# redistribute bgp route-map RR2_LO | Redistribute RR2's Lo from BGP to OSPF. This is required for eBGP session between RR1 and RR2. |
PE2-ASBR(config-router)# network 2.2.2.2/32 area 0.0.0.0 | Enable OSPF networks/links in area 0. |
PE2-ASBR(config-router)# network 12.1.1.0/24 area 0.0.0.0 | Enable OSPF networks/links in area 0. |
PE2-ASBR(config-router)#router ldp | Enter Router ldp mode. This is required to enable ldp globally on the router. |
PE2-ASBR(config-router)#router-id 2.2.2.2 | Set the router ID to IP address 2.2.2.2 |
PE2-ASBR(config-router)#transport-address ipv4 2.2.2.2 | Configure LDP transport address same as loopback address. |
PE2-ASBR(config-router)#interface xe20 | Enter interface mode. |
PE2-ASBR(config-if)# label-switching | Configure label-switching to enable MPLS forwarding on this interface. |
PE2-ASBR(config-if)# enable-ldp ipv4 | Enable LDP on this interface. |
PE2-ASBR(config-if)#interface xe5 | Enter interface mode. |
PE2-ASBR(config-if)# label-switching | Configure label-switching to enable MPLS forwarding on this interface. |
PE2-ASBR(config-if)#router bgp 65000 | Enter router BGP configuration mode. |
PE2-ASBR(config-router)# bgp router-id 2.2.2.2 | Configure BGP router-id. |
PE2-ASBR(config-router)# no bgp default ipv4-unicast | Configure BGP to disable default exchange of ipv4 unicast AFI/SAFI capability. |
PE2-ASBR (config-router)# address-family ipv4 unicast | Enter address-family ipv4 unicast mode |
PE2-ASBR(config-router-af)# redistribute ospf route-map RR1_LO | Redistribute RR1 Lo from OSPF to BGP. This is required for eBGP session between RR1 and RR2. |
PE2-ASBR(config-router-af)#exit | Exit address-family mode |
PE2-ASBR(config-router)# neighbor 20.1.1.40 remote-as 65001 | Configure PE3-ASBR as eBGP neighbor. |
PE2-ASBR(config-router)# neighbor 20.1.1.40 activate | Activate PE3-ASBR neighbor for IPv4 unicast AFI/SAFI. This is required to exchange the redistributed RR1 Lo prefix to PE3-ASBR eBGP peer. |
PE2-ASBR(config-router)# neighbor 31.31.31.31 remote-as 65000 | Configure RR1 as an iBGP neighbor. |
PE2-ASBR(config-router)# neighbor 31.31.31.31 update-source lo | Update the source of the iBGP session to loopbacl address. |
PE2-ASBR(config-router)# allocate-label all | Configure this command to allocate label for all advertised networks. |
PE2-ASBR(config-router)# address-family ipv4 labeled-unicast | Enter ipv4 labeled-unicast AFI/SAFI. |
PE2-ASBR(config-router-af)# neighbor 20.1.1.40 activate | Activate PE3-ASBR neighbor for IPv4 labeled-unicast. |
PE2-ASBR(config-router-af)# neighbor 31.31.31.31 activate | Activate RR1 neighbor for IPv4 labeled-unicast. |
PE2-ASBR(config-router-af)# neighbor 31.31.31.31 next-hop-self | Configure next-hop-self for the RR1 neighbor. |
PE2-ASBR(config-router-af)# exit-address-family | Exit this address-family. |
PE2-ASBR(config-router)#exit | Exit the router mode. |
PE2-ASBR (config)#commit | Commit candidate configuration to be running configuration. |
PE2-ASBR(config)#exit | Exit the config mode. |
PE3-ASBR
#configure terminal | Enter configure mode. |
PE3-ASBR(config)#interface lo | Enter interface mode. |
PE3-ASBR(config-if)# ip address 40.40.40.40/32 secondary | Assign a secondary IPv4 address to the loopbacl interface. |
PE3-ASBR(config-if)#interface xe5 | Enter interface mode. |
PE3-ASBR(config-if)# ip address 20.1.1.40/24 | Assign an IPv4 address to the interface. |
PE3-ASBR(config-if)#interface xe1 | Enter interface mode. |
PE3-ASBR(config-if)# ip address 21.1.1.40/24 | Assign an IPv4 address to the interface. |
PE3-ASBR(config-if)#ip access-list standard RR1_LO | Create an IP standard access list to permit RR1s loopbacl address. This is required to redistribute RR1 Lo from BGP to OSPF. |
PE3-ASBR(config-ip-acl-std)# permit host 31.31.31.31 | Permit RR1 loopback address. |
PE3-ASBR(config-ip-acl-std)#ip access-list standard RR2_LO | Create an IP standard access list to permit RR2 Lo address. This is required to redistribute RR2 Lo from OSPF to BGP. |
PE3-ASBR(config-ip-acl-std)# permit host 5.5.5.5 | Permit RR2s Loopback address. |
PE3-ASBR(config-ip-acl-std)#route-map RR1_LO permit 10 | Create a Route-map to allow RR1-LO address . This is required when redistributing from BGP to OSPF. |
PE3-ASBR(config-route-map)# match ip address RR1_LO | match the RR1_LO access list. |
PE3-ASBR(config-route-map)#route-map RR2_LO permit 10 | Create a Route-map to allow RR2-LO address . This is required when redistributing from OSPF to BGP. |
PE3-ASBR(config-route-map)# match ip address RR2_LO | match the RR2_LO access list. |
PE3-ASBR(config-route-map)#router ospf 1 | Enter router OSPF mode. |
PE3-ASBR(config-router)# ospf router-id 40.40.40.40 | Configure OSPF router-id explicitly (optional). |
PE3-ASBR(config-router)# redistribute bgp route-map RR1_LO | Redistribute RR2's Lo from OSPF to BGP. This is required for eBGP session between RR1 and RR2. |
PE3-ASBR(config-router)# network 21.1.1.0/24 area 0.0.0.0 | Enable OSPF networks/links in area 0. |
PE3-ASBR(config-router)# network 40.40.40.40/32 area 0.0.0.0 | Enable OSPF networks/links in area 0. |
PE3-ASBR(config-router)#router ldp | Enter Router LDP mode. This is required to enable LDP globally on the router. |
PE3-ASBR(config-router)#router-id 40.40.40.40 | Set the router ID to IP address 40.40.40.40 |
PE3-ASBR(config-router)#transport-address ipv4 40.40.40.40 | Configure LDP transport address same as loopback address |
PE3-ASBR(config-router)#interface xe5 | Enter interface mode. |
PE3-ASBR(config-if)# label-switching | Configure label-switching to enable MPLS forwarding on this interface. |
PE3-ASBR(config-if)#interface xe1 | Enter interface mode. |
PE3-ASBR(config-if)# label-switching | Configure label-switching to enable MPLS forwarding on this interface. |
PE3-ASBR(config-if)# enable-ldp ipv4 | Enable LDP on this interface. |
PE3-ASBR(config-if)#router bgp 65001 | Enter router BGP configuration mode. |
PE3-ASBR(config-router)# bgp router-id 40.40.40.40 | Configure BGP router-id. |
PE3-ASBR(config-router)# no bgp default ipv4-unicast | Configure BGP to disable default exchange of ipv4 unicast AFI/SAFI capability. |
PE3-ASBR(config-router)# redistribute ospf route-map RR2_LO | Redistribute RR2 Lo from OSPF to BGP. This is required for eBGP session between RR1 and RR2. |
PE3-ASBR(config-router)# neighbor 5.5.5.5 remote-as 65001 | Configure RR2 as eBGP neighbor. |
PE3-ASBR(config-router)# neighbor 5.5.5.5 update-source lo | Update the source of the iBGP session to loopback address. |
PE3-ASBR(config-router)# neighbor 20.1.1.2 remote-as 65000 | Configure PE2-ASBR as an eBGP neighbor. |
PE3-ASBR(config-router)# neighbor 20.1.1.2 activate | Activate PE2-ASBR neighbor for IPv4 unicast AFI/SAFI. This is required to exchange the redistributed RR1 Lo prefix to PE2-ASBR eBGP peer. |
PE3-ASBR(config-router)# allocate-label all | Configure this command to allocate label for all advertised networks. |
PE3-ASBR(config-router)# address-family ipv4 labeled-unicast | Enter ipv4 labeled-unicast AFI/SAFI. |
PE3-ASBR(config-router-af)# neighbor 5.5.5.5 activate | Activate RR1 neighbor for IPv4 labeled-unicast. |
PE3-ASBR(config-router-af)# neighbor 5.5.5.5 next-hop-self | Configure next-hop-self for the RR2 neighbor. |
PE3-ASBR(config-router-af)# neighbor 20.1.1.2 activate | Activate PE2-ASBR neighbor for IPv4 labeled-unicast. |
PE3-ASBR(config-router-af)# ex-it-address-family | Exit this address-family. |
PE3-ASBR(config-router)#exit | Exit the router mode. |
PE3-ASBR(config)#commit | Commit candidate configuration to be running configuration. |
PE3-ASBR(config)#exit | Exit the config mode. |
RR2
#configure terminal | Enter configure mode. |
RR2(config)#interface lo | Enter interface mode. |
RR2(config-if)# ip address 5.5.5.5/32 secondary | Assign the IPv4 address. |
RR2(config-if)#interface xe22 | Enter interface mode. |
RR2(config-if)# ip address 23.1.1.2/24 | Assign the IPv4 address. |
RR2(config-if)#router ospf 1 | Enter router OSPF mode. |
RR2(config-router)# ospf router-id 5.5.5.5 | Configure OSPF router-id explicitly (optional). |
RR2(config-router)# network 5.5.5.5/32 area 0.0.0.0 | Enable networks for OSPF protocol under area 0. |
RR2(config-router)# network 23.1.1.0/24 area 0.0.0.0 | Enable networks for OSPF protocol under area 0. |
RR2(config-router)#router bgp 65001 | Enter BGP router mode. |
RR2(config-router)# bgp router-id 5.5.5.5 | Configure BGP router-id. |
RR2(config-router)# no bgp default ipv4-unicast | Disable default ipv4-unicast capability exchange with BGP neighbors. |
RR2(config-router)# no bgp inbound-route-filter | Disable inbound route-filtering for bgp VPNV4 routes. This is required for Route-reflectors. |
RR2(config-router)# neighbor 28.28.28.28 remote-as 65001 | Configure PE2-ASBR as iBGP neighbor. |
RR2(config-router)# neighbor 28.28.28.28 update-source lo | Configure BGP speaker to use loopback address as source for BGP session. |
RR2(config-router)# neighbor 31.31.31.31 remote-as 65000 | Configure RR2 as an eBGP neighbor. |
RR2(config-router)# neighbor 31.31.31.31 ebgp-multihop | Enable multihop on eBGP session. |
RR2(config-router)# neighbor 31.31.31.31 update-source lo | Configure BGP speaker to use loopback address as source for this BGP session. |
RR2(config-router)# neighbor 40.40.40.40 remote-as 65001 | Configure PE1 as an iBGP neighbor. |
RR2(config-router)# neighbor 40.40.40.40 update-source lo | Configure BGP speaker to use loopback address as source for this BGP session. |
RR2(config-router)# allocate-label all | Configure this peer to allocate label for all advertised networks. |
RR2(config-router)# address-family ipv4 labeled-unicast | Enter ipv4 labeled-unicast address-family. |
RR2(config-router-af)# neighbor 28.28.28.28 activate | Activate PE2-ASBR for this AFI/SAFI. |
RR2(config-router-af)# neighbor 28.28.28.28 route-reflector-client | Configure PE2-ASBR as Route-reflector client. |
RR2(config-router-af)# neighbor 40.40.40.40 activate | Activate PE1 for this AFI/SAFI. |
RR2(config-router-af)# neighbor 40.40.40.40 route-reflector-client | Configure PE1 as Route-reflector client. |
RR2(config-router-af)# exit-address-family | Exit ipv4 labeled-unicast address-family. |
RR2(config-router)# address-family vpnv4 unicast | Enter vpnv4 unicast address-family. |
RR2(config-router-af)# neighbor 28.28.28.28 activate | Allow eBGP vpn route exchange for the RR2 eBGP neighbor. |
RR2(config-router-af)# neighbor 28.28.28.28 route-reflector-client | Activate the RR2 eBGP neighbor. |
RR2(config-router-af)# neighbor 31.31.31.31 allow-ebgp-vpn | Configure next-hop unchanged for this eBGP neighbor for all vpnv4 NLRIs to keep original next-hop while advertising to this eBGP neighbor. |
RR2(config-router-af)# neighbor 31.31.31.31 activate | Activate PE1 iBGP neighbor. |
RR2(config-router-af)# neighbor 31.31.31.31 attribute-unchanged next-hop | Configure PE1 as Route-reflector client for this AFI/SAFI. |
RR2(config-router-af)# exit-address-family | Exit Address-family mode. |
RR2(config-router)#exit | Exit the router mode. |
RR2(config)#commit | Commit candidate configuration to be running configuration. |
RR2(config)#exit | Exit the config mode. |
P2
P2(config)#interface lo | Enter interface mode. |
P2(config-if)# ip address 6.6.6.6/32 secondary | Assign the secondary IPv4 address on loopback interface. |
P2(config-if)#interface xe22 | Enter interface mode. |
P2(config-if)# ip address 23.1.1.1/24 | Assign the IPv4 address. |
P2(config-if)#interface xe0 | Enter interface mode. |
P2(config-if)# ip address 21.1.1.5/24 | Assign the IPv4 address. |
P2(config-if)#interface xe11 | Enter interface mode. |
P2(config-if)# ip address 22.1.1.5/24 | Assign the IPv4 address. |
P2(config-if)#router ospf 1 | Enter router OSPF mode. |
P2(config-router)# ospf router-id 6.6.6.6 | Configure OSPF router-id (optional). |
P2(config-router)# network 6.6.6.6/32 area 0.0.0.0 | Enable networks for OSPF protocol. |
P2(config-router)# network 21.1.1.0/24 area 0.0.0.0 | Enable networks for OSPF protocol. |
P2(config-router)# network 22.1.1.0/24 area 0.0.0.0 | Enable networks for OSPF protocol. |
P2(config-router)# network 23.1.1.0/24 area 0.0.0.0 | Enable networks for OSPF protocol. |
P2(config-router)#router ldp | Enter router ldp mode. This is required to enable LDP globally on the router. |
P2(config-router)#router-id 6.6.6.6 | Set the router ID to IP address 6.6.6.6 |
P2(config-router)#transport-address ipv4 6.6.6.6 | Configure LDP transport address same as loopback address. |
P2(config-router)#interface xe0 | Enter interface configuration mode. |
P2(config-if)# label-switching | Configure label-switching on the interface. |
P2(config-if)# enable-ldp ipv4 | Enable LDP on the interface. |
P2(config-if)#interface xe11 | Enter interface configuration mode. |
P2(config-if)# label-switching | Configure label-switching on the interface. |
P2(config-if)# enable-ldp ipv4 | Enable LDP on the interface. |
P2(config-if)#exit | Exit interface mode. |
P2(config)#commit | Commit candidate configuration to be running configuration. |
P2(config)#exit | Exit the config mode. |
PE4
#configure terminal | Enter configure mode. |
PE4(config)#interface lo | Enter interface mode. |
PE4(config-if)# ip address 28.28.28.28/32 secondary | Assign the secondary IPv4 address on the loopback interface. |
PE4(config-if)#ip vrf vrf1 | Create a new VRF named vrf1. |
PE4(config-vrf)# rd 1:1 | Assign the route distinguisher (RD) value as 1:1. |
PE4(config-vrf)# route-target both 1:1 | Configure import and export route-target values. |
PE4(config-vrf)#interface xe21 | Enter interface mode. |
PE4(config-if)# ip vrf forwarding vrf1 | Bind the interface connected to the CE router with VRF vrf1. |
PE4(config-if)# ip address 30.1.1.1/24 | Assign the IPv4 address. |
PE4(config-if)#interface xe11 | Enter interface mode. |
PE4(config-if)# ip address 22.1.1.28/24 | Assign the IPv4 address. |
PE4(config-if)#router ospf 1 | Enter router OSPF mode. |
PE4(config-router)# ospf router-id 28.28.28.28 | Configure OSPF router id same as loopback ip address. |
PE4(config-router)# network 22.1.1.0/24 area 0.0.0.0 | Define the network on which OSPF runs and associate area id. |
PE4(config-router)# network 28.28.28.28/32 area 0.0.0.0 | Define the network on which OSPF runs and associate area id. |
PE4(config-router)#router ldp | Enter router LDP mode. |
PE4(config-router)#router-id 28.28.28.28 | Set the router ID to IP address 28.28.28.28 |
PE4(config-router)#transport-address ipv4 28.28.28.28 | Configure LDP transport address same as loopback address. |
PE4(config-router)#interface xe11 | Enter interface mode. |
PE4(config-if)# label-switching | Enable label switching in interface. |
PE4(config-if)# enable-ldp ipv4 | Enable LDP in interface. |
PE4(config-if)#router bgp 65001 | Enter BGP router mode. |
PE4(config-router)# bgp router-id 28.28.28.28 | Configure BGP router-id. |
PE4(config-router)# no bgp default ipv4-unicast | Configure BGP peer to have no ipv4 unicast capability exchange by default. |
PE4(config-router)# address-family ipv4 unicast | Enter the IPv4 unicast address family. |
PE4(config-router-af)# network 28.28.28.28/32 | advertise the network of this BGP speaker. |
PE4(config-router-af)# exit-address-family | Exit address family mode. |
PE4(config-router)# neighbor 5.5.5.5 remote-as 65001 | configure neighbor with remote AS. |
PE4(config-router)# neighbor 5.5.5.5 update-source lo | Update the loopback as the source of BGP session. |
PE4(config-router)# allocate-label all | Allocate the label for all advertised networks. |
PE4(config-router)# address-family ipv4 labeled-unicast | Enter the IPv4 labeled-unicast address family. |
PE4(config-router-af)# neighbor 5.5.5.5 activate | Activate the neighbor under the address-family. |
PE4(config-router-af)# exit-address-family | Exit IPv4 labeled-unicast Address Family mode. |
PE4(config-router)# address-family vpnv4 unicast | Enter vpnv4 unicast address-family mode. |
PE4(config-router-af)# neighbor 5.5.5.5 activate | Activate the neighbor under vpnv4 unicast address-family. |
PE4(config-router-af)# exit-address-family | Exit vpnv4 unicast address-family. |
PE4(config-router)# address-family ipv4 vrf vrf1 | Enter ipv4 VRF address-family mode. |
PE4(config-router-af)# redistribute connected | Redistribute connected networks under VRF address-family. |
PE4(config-router-af)# exit-address-family | Exit ipv4 VRF address-family. |
PE4(config-router)#exit | Exit the router mode. |
PE4(config)#commit | Commit candidate configuration to be running configuration. |
PE4(config)#exit | Exit the config mode. |
Last modified date: 10/17/2023