Overview
The Label space refers to the scope of labels in a given LSR. It determines assignment and distribution of labels to a given peer. During data flow, it decides the key for looking up MPLS table and takes appropriate action based on the entry.
OcNOS supports per-platform label space, where a label must be unique for the entire platform. A label is interpreted the same way at all the interfaces. The FIB entry in the router does not contain incoming interface-related information. Thus the incoming traffic will be matched only with the label.
Topology
Figure 1-1: LDP Topology
PE1
PE1#configure terminal | Enter configure mode |
PE1(config)#interface lo | Enter interface mode. |
PE1(config-if)#ip address 1.1.1.1/32 secondary | Configure IP address for the loopback address |
PE1(config-if)#exit | Exit interface mode |
PE1(config)#interface xe6 | Specify the interface (xe6)to be configured |
PE1(config-if)#ip address 10.10.10.1/24 | Configure IP address for the interface |
PE1(config-if)#no shutdown | Administratively bringing up the interface |
PE1(config-if)#exit | Exit interface mode |
PE1(config)#router ospf 100 | Configure the routing process and specify the Process ID (100) |
PE1(config-router)#ospf router-id 1.1.1.1 | Configure OSPF router ID same as loopback IP address |
PE1(config-router)#network 10.10.10.0/24 area 0 PE1(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 |
PE1(config-router)#exit | Exit configure mode |
PE1(config)#router ldp | Enter router mode for LDP |
PE1(config-router)#router-id 1.1.1.1 | Set the router ID to IP address 1.1.1.1 |
PE1(config-router)#transport-address ipv4 1.1.1.1 | Configure the transport address to be used for a TCP session over which LDP will run on an IPv4 interface. Note: It is preferable to use the loopback address as transport address. In addition, use the parameter "ipv6" if you are configuring an IPv6 interface. |
PE1(config-router)# targeted-peer ipv4 3.3.3.3 | Configure targeted peer. |
PE1(config-router-targeted-peer)#exit | Exit from router target peer and LDP mode |
PE1(config-if)#exit | Exit interface mode |
PE1(config)#interface xe6 | Specify the interface (xe6)to be configured |
PE1(config-if)#label-switching | Enabling label switching capability on router |
PE1(config-if)#enable-ldp ipv4 | Enabling ldp on interface |
PE1(config-if)#commit | Commit the transaction. |
P
P#configure terminal | Enter configure mode. |
P(config)#interface lo | Enter interface mode. |
P(config-if)#ip address 2.2.2.2/32 secondary | Configure IP address for the loopback address |
P(config-if)#exit | Exit interface mode |
P(config)#interface xe6 | Specify the interface (xe6)to be configured |
P(config-if)#ip address 10.10.10.2/24 | Configure IP address for the interface |
P(config-if)#no shutdown | Administratively bringing up the interface |
P(config)#interface xe1 | Specify the interface (xe1)to be configured |
P(config-if)#ip address 20.20.20.1/24 | Configure IP address for the interface |
P(config)#router ospf 100 | Configure the routing process and specify the Process ID (100) |
P(config-router)#ospf router-id 2.2.2.2 | Configure OSPF router ID same as loopback IP address |
P(config-router)#network 10.10.10.0/24 area 0 P(config-router)#network 20.20.20.0/24 area 0 P(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 |
P(config-router)#exit | Exit router mode |
P(config)#router ldp | Enter router mode for LDP |
P(config-router)#router-id 2.2.2.2 | Set the router ID to IP address 2.2.2.2 |
P(config-router)#transport-address ipv4 2.2.2.2 | Configure the transport address to be used for a TCP session over which LDP will run on an IPv4 interface. Note: It is preferable to use the loopback address as transport address. In addition, use the parameter "ipv6" if you are configuring an IPv6 interface. |
P(config-router)#exit | Exit router mode for LDP |
P(config)#mpls min-label-value 1000 max-label-value 50000 label-space 0 | Configure the minimum label value and maximum label value to be used by Platform label space (Label space 0) |
P(config)#interface xe6 | Specify the interface (xe6)to be configured |
P(config-if)#label-switching | Enabling label switching capability on router |
P(config-if)#enable-ldp ipv4 | Enabling ldp on interface |
P(config-if)#exit | Exit interface mode |
P(config)#interface xe1 | Specify the interface (xe1) to be configured |
P(config-if)#label-switching | Enabling label switching capability on router |
P(config-if)#enable-ldp ipv4 | Enabling ldp on interface |
P(config-if)#commit | Commit the transaction. |
PE2
PE2#configure terminal | Enter configure mode. |
PE2(config)#interface lo | Enter interface mode. |
PE2(config-if)#ip address 3.3.3.3/32 secondary | Configure IP address for the loopback address |
PE2(config-if)#exit | Exit interface mode |
PE2(config)#interface xe1 | Specify the interface (xe1)to be configured |
PE2(config-if)#ip address 20.20.20.2/24 | Configure IP address for the interface |
PE2(config-if)#no shutdown | Administratively bringing up the interface |
PE2(config-if)#exit | Exit interface mode |
PE2(config)#router ospf 100 | Configure the routing process and specify the Process ID (100) |
PE2(config-router)#ospf router-id 3.3.3.3 | Configure OSPF router ID same as loopback IP address |
PE2(config-router)#network 20.20.20.0/24 area 0 PE2(config-router)#network 3.3.3.3/32 area 0 | Define the interface on which OSPF runs and associate the area ID (0)with the interface |
PE2(config-router)#exit | Exit router mode |
PE2(config)#router ldp | Enter router mode for LDP |
PE2(config-router)#router-id 3.3.3.3 | Set the router ID to IP address 3.3.3.3 |
(config-router)#transport-address ipv4 3.3.3.3 | Configure the transport address to be used for a TCP session over which LDP will run on an IPv4 interface. Note: It is preferable to use the loopback address as transport address. In addition, use the parameter "ipv6" if you are configuring an IPv6 interface. |
PE2(config-router)# targeted-peer ipv4 1.1.1.1 | Configure targeted peer. |
PE1(config-router-targeted-peer)#exit | Exit from router target peer and LDP mode |
PE2(config-router)#exit | Exit router mode for LDP |
PE2(config)#interface xe1 | Specify the interface (xe1) to be configured |
PE2(config-if)#label-switching | Enabling label switching capability on router |
PE2(config-if)#enable-ldp ipv4 | Enabling ldp on interface |
PE2(config-if)#commit | Commit the transaction. |
Last modified date: 10/17/2023