OcNOS-RON-6.3.1 : Multi-Protocol Label Switching Guide : Multi-Protocol Label Switching Configuration Guide : L3VPN GR Configuration : L3VPN GR Configuration
L3VPN GR Configuration
Configuration
Below are the configurations and validations of L3VPN GR with OSPF as IGP. We can also configure ISIS as IGP and LDP/RSVP as transport.
PE1
 
#configure terminal
Enter configuration mode.
(config)#interface lo
Specify the loopback (lo) interface to be configured.
(config-if)#ip address 1.1.1.1/32 secondary
Set the IP address of the loopback interface to 1.1.1.1/32
(config-if)#exit
Exit interface mode.
(config)#ip vrf l3vpn
Configure IP VRF L3VPN.
(config-vrf)#rd 1:300
Enter RD value.
(config-vrf)#route-target both 300:400
Enter RT value.
(config-vrf)#exit
Exiting from VRF mode.
(config)#router ldp
Enter router mode for LDP.
(config-router)#router-id 1.1.1.1
Set the router ID to IP address 1.1.1.1.
(config-router)#targeted-peer ipv4 2.2.2.2
Configure targeted peer.
(config-router-targeted-peer)#exit-targeted- peer-mode
Exit-targeted-peer-mode
(config-router)#targeted-peer ipv4 5.5.5.5
Configure targeted peer.
(config-router-targeted-peer)#exit-targeted- peer-mode
Exit-targeted-peer-mode
(config-router)#exit
Exit router mode
(config)#interface xe1
Enter interface mode.
(config-if)#ip address 10.10.10.1/24
Configure IPv4 address for xe1.
(config-if)#label-switching
Enable label switching on interface xe1.
(config-if)#enable-ldp ipv4
Enable LDP for IPv4 on xe1.
(config-if)#exit
Exit interface mode
(config)#interface xe2.1
Configure access-port .
(config-if)#description MPLS-L3VPN
Giving Interface Description
(config-if)#encapsulation dot1q 4
Setting Encapsulation to dot1q with VLAN ID 4
(config-if)#load-interval 30
Load interval setting
(config-if)#ip vrf forwarding l3vpn
Bind the interface connected to the CE router with VRF l3vpn
(config-if)#ip address 172.168.25.2/24
Assign the IPv4 address.
(config)#router ospf 1
Configure the routing process and specify the Process ID 100. The Process ID should be a unique positive integer identifying the routing process.
(config)#ospf router-id 1.1.1.1
Configure OSPF router-ID same as loopback interface IP address
(config-router) #network 1.1.1.1/32 area 0
Define the interface on which OSPF runs and associate the area ID (0) with the interface.
(config-router) #network 10.10.10.0/24 area 0
Define the interface on which OSPF runs and associate the area ID (0) with the interface.
(config-if)#exit
Exit interface mode.
(config)#router bgp 100
Enter router BGP mode
(config-router)#bgp router-id 1.1.1.1
Configuring the BGP router id 1.1.1.1.
(config-router)#bgp graceful-restart restart-time 100
Enable BGP GR with restart timer 100.
(config-router)#neighbor 5.5.5.5 remote-as 100
Configure neighbor 5.5.5.5.
(config-router)#neighbor 5.5.5.5 update-source lo
Update source lo for neighbor 5.5.5.5.
(config-router)#address-family ipv4 unicast
Enter address-family IPv4 unicast.
(config-router-af)#redistribute connected
Redistribute connected.
(config-router)#neighbor 5.5.5.5 activate
Activate neighbor.
(config-router)#address-family vpnv4 unicast
Entering Address family VPNv4 unicast.
(config-router-af)#neighbor 5.5.5.5 activate
Activate the neighbor 5.5.5.5.
(config-router-af)#neighbor 5.5.5.5 capability graceful-restart
Activate capability graceful restart for neighbor 5.5.5.5.
(config-router-af)#exit-address-family
Exit address family.
(config-router)#address-family ipv4 vrf l3vpn
Entering address family.
(config-router-af)#redistribute connected
Redistribute connected.
(config-router)#neighbor 172.168.25.1 remote-as 600
Configure neighbor 172.168.25.1.
(config-router)#neighbor 172.168.25.1 activate
Activate neighbor.
(config-router-af)#commit
Commit all the transactions.
P1
 
#configure terminal
Enter configuration mode.
(config)#interface lo
Specify the loopback (lo) interface to be configured.
(config-if)#ip address 2.2.2.2/32 secondary
Set the IP address of the loopback interface to 2.2.2.2/32.
(config-if)#exit
Exit interface mode.
(config)#router ldp
Enter router mode for LDP.
(config-router)#router-id 2.2.2.2
Set the router ID to IP address 2.2.2.2.
(config-router)#transport-address ipv4 2.2.2.2 0
Configure the transport address for IPV4 (for IPV6, use ipv6) to be used for a TCP session over which LDP will run.
Note:
It is preferable to use the loopback address as the transport address.
(config-router)#targeted-peer ipv4 1.1.1.1
Configure targeted peer.
(config-router-targeted-peer)#exit-targeted- peer-mode
Exit-targeted-peer-mode.
(config-router)#targeted-peer ipv4 5.5.5.5
Configure targeted peer.
(config-router-targeted-peer)#exit-targeted- peer-mode
Exit-targeted-peer-mode.
(config-router)#exit
Exit-targeted-peer-mode.
(config-if)#exit
Exit router mode.
(config)#interface xe1
Enter interface mode.
(config-if)#ip address 10.10.10.2/24
Configure IPv4 address for xe1.
(config-if)#label-switching
Enable label switching on interface xe1.
(config-if)#enable-ldp ipv4
Enable LDP for IPv4 on xe1.
(config-if)#exit
Exit interface mode.
(config)#interface xe2
Enter interface mode.
(config-if)#ip address 40.40.40.1/24
Configure IPv4 address for xe2.
(config-if)#label-switching
Enable label switching on interface xe2.
(config-if)#enable-ldp ipv4
Enable LDP for IPv4 on xe2.
(config-if)#exit
Exit interface mode.
(config)#router ospf 1
Configure the routing process and specify the Process ID. The Process ID should be a unique positive integer identifying the routing process.
(config)#ospf router-id 2.2.2.2
Configure OSPF router-ID same as loopback interface IP address.
(config-router) #network 2.2.2.2/32 area 0
Define the interface on which OSPF runs and associate the area ID (0) with the interface.
(config-router) #network 10.10.10.0/24 area 0
Define the interface on which OSPF runs and associate the area ID (0) with the interface.
(config-router)#network 40.40.40.0/24 area 0
Define the interface on which OSPF runs and associate the area ID (0) with the interface.
(config-router)#bfd all-interfaces
Enable the OSPF enabled interfaces with BFD.
(config-if)#exit
Exit interface mode.
PE-2
 
#configure terminal
Enter configuration mode.
(config)#interface lo
Specify the loopback (lo) interface to be configured.
(config-if)#ip address 5.5.5.5/32 secondary
Set the IP address of the loopback interface to 5.5.5.5/32.
(config-if)#exit
Exit interface mode.
(config)#ip vrf l3vpn
Configure IP VRF L3VPN.
(config-vrf)#rd 1:300
Enter RD value.
(config-vrf)#route-target both 300:400
Enter RT value.
(config-vrf)#exit
Exiting from VRF mode.
(config)#router ldp
Enter router mode for LDP.
(config-router)#router-id 5.5.5.5
Set the router ID to IP address 5.5.5.5.
(config-router)#targeted-peer ipv4 1.1.1.1
Configure targeted peer.
(config-router-targeted-peer)#exit-targeted- peer-mode
Exit-targeted-peer-mode.
(config-router)#targeted-peer ipv4 2.2.2.2
Configure targeted peer.
(config-router-targeted-peer)#exit-targeted-peer-mode
Exit-targeted-peer-mode.
(config-router)#exit
Exit router mode.
(config)#interface xe1
Enter interface mode.
(config-if)#ip address 40.40.40.2/24
Configure IPv4 address for xe1.
(config-if)#label-switching
Enable label switching on interface xe1.
(config-if)#enable-ldp ipv4
Enable LDP for IPv4 on xe1.
(config-if)#exit
Exit interface mode.
(config-if)#exit
Exit interface mode.
(config)#interface xe2.1
Enter interface mode.
(config-if)#description MPLS-L3VPN
Giving Interface Description.
(config-if)#encapsulation dot1q 4
Setting Encapsulation to dot1q with VLAN ID 4.
(config-if)#load-interval 30
Load interval setting.
(config-if)#ip vrf forwarding l3vpn
Bind the interface connected to the CE router with VRF L3VPN.
(config-if)#ip address 172.168.25.2/24
Assign the IPv4 address.
(config)#router ospf 1
The Process ID should be a unique positive integer identifying the routing process.
(config)#ospf router-id 5.5.5.5
Configure OSPF router-ID same as loopback interface IP address.
(config-router) #network 5.5.5.5/32 area 0
Define the interface on which OSPF runs and associate the area ID (0) with the interface.
(config-router) #network 40.40.40.0/24 area 0
Define the interface on which OSPF runs and associate the area ID (0) with the interface.
(config-if)#exit
Exit interface mode.
(config)#router bgp 100
Enter router BGP mode
(config-router)#bgp router-id 5.5.5.5
Configuring the bgp router id 1.1.1.1.
(config-router)#bgp graceful-restart restart-time 100
Enable BGP GR with restart timer 100.
(config-router)#neighbor 1.1.1.1 remote-as 100
Configure neighbor 1.1.1.1.
(config-router)#neighbor 1.1.1.1 update-source lo
Update source lo for neighbor 1.1.1.1.
(config-router)#address-family ipv4 unicast
Enter address-family ipv4 unicast.
(config-router-af)#redistribute connected
Redistribute connected.
(config-router)#neighbor 1.1.1.1 activate
Activate neighbor.
(config-router)#address-family vpnv4 unicast
Entering Address family VPNv4 unicast.
(config-router-af)#neighbor 1.1.1.1 activate
Activate the neighbor 1.1.1.1.
(config-router-af)#neighbor 1.1.1.1 capability graceful-restart
Activate capability graceful restart for neighbor 1.1.1.1.
(config-router-af)#exit-address-family
Exit address family.
(config-router)#address-family ipv4 vrf l3vpn
Entering address family.
(config-router-af)#redistribute connected
Redistribute connected.
(config-router)#neighbor 172.168.26.1 remote-as 700
Configure neighbor 172.168.26.1.
(config-router)#neighbor 172.168.26.1 activate
Activate neighbor.
(config-router-af)#commit
Commit all the transactions.
Validation
Restart BGP Gracefully
PE1:
 
PE1#restart bgp graceful
%Warning : BGP process will stop and needs to restart manually,
You may lose bgp configuration,if not saved
Proceed for graceful restart? (y/n):y
%% Managed module is down or crashed
 
R1#show mpls ilm-table
Codes: > - installed ILM, * - selected ILM, p - stale ILM
K - CLI ILM, T - MPLS-TP, s - Stitched ILM
S - SNMP, L - LDP, R - RSVP, C - CRLDP
B - BGP , K - CLI , V - LDP_VC, I - IGP_SHORTCUT
O - OSPF/OSPF6 SR, i - ISIS SR, k - SR CLI
P - SR Policy, U - unknown
 
Code FEC/VRF/L2CKT ILM-ID In-Label Out-Label In-Intf Out-Intf/VRF Nexthop LSP-Type
LSP_DEFAULT
B> p 77.77.80.0/24 7 24323 Nolabel N/A l3vpn N/A LSP_DEFAULT
B> p 77.77.78.0/24 5 24321 Nolabel N/A l3vpn N/A LSP_DEFAULT
B> p 77.77.77.0/24 4 24320 Nolabel N/A l3vpn N/A LSP_DEFAULT
B> p 77.77.79.0/24 6 24322 Nolabel N/A l3vpn N/A LSP_DEFAULT
B> p 77.77.81.0/24 8 24324 Nolabel N/A l3vpn N/A LSP_DEFAULT
B> p 172.168.25.0/24 9 24325 Nolabel N/A l3vpn N/A LSP_DEFAULT
V l2ckt:900 1 24960 Nolabel po1 xe1 N/A LSP_DEFAULT
 
PE1#show mpls vrf-forwarding-table
Codes: > - installed FTN, * - selected FTN, p - stale FTN, B - BGP FTN
(m) - Service mapped over multipath transport
 
Code FEC FTN-ID Tunnel-id Pri LSP-Type Out-Label Out-Intf Nexthop
B> p 88.88.88.0/24 1 0 Yes LSP_DEFAULT 24321 - 5.5.5.5
B>p 88.88.89.0/24 2 0 Yes LSP_DEFAULT 24321 - 5.5.5.5
B> p 88.88.90.0/24 3 0 Yes LSP_DEFAULT 24321 - 5.5.5.5
B >p 88.88.91.0/24 4 0 Yes LSP_DEFAULT 24321 - 5.5.5.5
B >p 88.88.92.0/24 5 0 Yes LSP_DEFAULT 24321 - 5.5.5.5
B> p 172.168.26.0/24 6 0 Yes LSP_DEFAULT 24321 - 5.5.5.5
 
PE1#show nsm forwarding-timer
Protocol-Name GR-State Time Remaining (sec) Disconnected-time
BGP ACTIVE 74 2022/01/13 16:33:43
 
PE#show run bgp
!
PE1#show ip bgp vpnv4 all
 
PE2:
 
PE2#show ip bgp vpnv4 all
Status codes: s suppressed, d damped, h history, a add-path, * valid, > best, i - internal, l - labeled
S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
 
Network Next Hop Metric LocPrf Weight Path
Route Distinguisher: 1:300 (Default for VRF l3vpn)
*>i 77.77.77.0/24 1.1.1.1 0 100 0 600 i
*>i 77.77.78.0/24 1.1.1.1 0 100 0 600 i
*>i 77.77.79.0/24 1.1.1.1 0 100 0 600 i
*>i 77.77.80.0/24 1.1.1.1 0 100 0 600 i
*>i 77.77.81.0/24 1.1.1.1 0 100 0 600 i
*> l 88.88.88.0/24 172.168.26.1 0 100 0 700 i
*> l 88.88.89.0/24 172.168.26.1 0 100 0 700 i
*> l 88.88.90.0/24 172.168.26.1 0 100 0 700 i
*> l 88.88.91.0/24 172.168.26.1 0 100 0 700 i
*> l 88.88.92.0/24 172.168.26.1 0 100 0 700 i
*>i 172.168.25.0/24 1.1.1.1 0 100 0 ?
*> l 172.168.26.0/24 0.0.0.0 0 100 32768 ?
Announced routes count = 6
Accepted routes count = 6
Route Distinguisher: 1:300
S>i 77.77.77.0/24 1.1.1.1 0 100 0 600 i
S>i 77.77.78.0/24 1.1.1.1 0 100 0 600 i
S>i 77.77.79.0/24 1.1.1.1 0 100 0 600 i
S>i 77.77.80.0/24 1.1.1.1 0 100 0 600 i
S>i 77.77.81.0/24 1.1.1.1 0 100 0 600 i
S>i 172.168.25.0/24 1.1.1.1 0 100 0 ?
Announced routes count = 0
 
After Restarting the BGP Manually
PE1:
 
PE1#start-shell
bash-5.0$ su
Password:
root@PE1:/home/ocnos# cd /usr/local/sbin/
root@PE1:/usr/local/sbin# ./bgpd -d
 
PE1#show mpls ilm-table
Codes: > - installed ILM, * - selected ILM, p - stale ILM
K - CLI ILM, T - MPLS-TP, s - Stitched ILM
S - SNMP, L - LDP, R - RSVP, C - CRLDP
B - BGP , K - CLI , V - LDP_VC, I - IGP_SHORTCUT
O - OSPF/OSPF6 SR, i - ISIS SR, k - SR CLI
P - SR Policy, U - unknown
 
Code FEC/VRF/L2CKT ILM-ID In-Label Out-Label In-Intf Out-Intf/VRF Nexthop LSP-Type
B> 77.77.80.0/24 7 24323 Nolabel N/A l3vpn N/A LSP_DEFAULT
B> 77.77.78.0/24 5 24321 Nolabel N/A l3vpn N/A LSP_DEFAULT
B> 77.77.77.0/24 4 24320 Nolabel N/A l3vpn N/A LSP_DEFAULT
B> 77.77.79.0/24 6 24322 Nolabel N/A l3vpn N/A LSP_DEFAULT
B> 77.77.81.0/24 8 24324 Nolabel N/A l3vpn N/A LSP_DEFAULT
B> 172.168.25.0/24 9 24325 Nolabel N/A l3vpn N/A LSP_DEFAULT
V l2ckt:900 1 24960 Nolabel po1 xe1 N/A LSP_DEFAULT
 
PE1#show mpls vrf-forwarding-table
Codes: > - installed FTN, * - selected FTN, p - stale FTN, B - BGP FTN
(m) - Service mapped over multipath transport
 
Code FEC FTN-ID Tunnel-id Pri LSP-Type Out-Label Out-Intf Nexthop
B>88.88.88.0/24 1 0 Yes LSP_DEFAULT 24321 - 5.5.5.5
B>88.88.89.0/24 2 0 Yes LSP_DEFAULT 24321 - 5.5.5.5
B>88.88.90.0/24 3 0 Yes LSP_DEFAULT 24321 - 5.5.5.5
B>88.88.91.0/24 4 0 Yes LSP_DEFAULT 24321 - 5.5.5.5
B>88.88.92.0/24 5 0 Yes LSP_DEFAULT 24321 - 5.5.5.5
B> 172.168.26.0/24 6 0 Yes LSP_DEFAULT 24321 - 5.5.5.5
 
PE2:
 
PE2#show ip bgp vpnv4 all
Status codes: s suppressed, d damped, h history, a add-path, * valid, > best, i - internal, l - labeled
S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
 
Network Next Hop Metric LocPrf Weight Path
Route Distinguisher: 1:300 (Default for VRF l3vpn)
*>i 77.77.77.0/24 1.1.1.1 0 100 0 600 i
*>i 77.77.78.0/24 1.1.1.1 0 100 0 600 i
*>i 77.77.79.0/24 1.1.1.1 0 100 0 600 i
*>i 77.77.80.0/24 1.1.1.1 0 100 0 600 i
*>i 77.77.81.0/24 1.1.1.1 0 100 0 600 i
*> l 88.88.88.0/24 172.168.26.1 0 100 0 700 i
*> l 88.88.89.0/24 172.168.26.1 0 100 0 700 i
*> l 88.88.90.0/24 172.168.26.1 0 100 0 700 i
*> l 88.88.91.0/24 172.168.26.1 0 100 0 700 i
*> l 88.88.92.0/24 172.168.26.1 0 100 0 700 i
*>i 172.168.25.0/24 1.1.1.1 0 100 0 ?
*> l 172.168.26.0/24 0.0.0.0 0 100 32768 ?
Announced routes count = 6
Accepted routes count = 6
Route Distinguisher: 1:300
>i 77.77.77.0/24 1.1.1.1 0 100 0 600 i
>i 77.77.78.0/24 1.1.1.1 0 100 0 600 i
>i 77.77.79.0/24 1.1.1.1 0 100 0 600 i
>i 77.77.80.0/24 1.1.1.1 0 100 0 600 i
>i 77.77.81.0/24 1.1.1.1 0 100 0 600 i
>i 172.168.25.0/24 1.1.1.1 0 100 0 ?
Announced routes count = 0
 
Last modified date: 07-13-2023