Example for Configuring Remote MPLS LDP Sessions
Networking Requirements
As shown in Figure 3-22, LSRA and LSRC are PEs of the IP/MPLS backbone network. MPLS L2VPN services need to be deployed on LSRA and LSRC to connect VPN sites at Layer 2, so remote LDP sessions need to be deployed between LSRA and LSRC to implement VC label exchange.
Configuration Roadmap
If LSRA is directly connected to LSRC, local LDP sessions established on LSRs can be used to set up LDP LSPs to transmit services and exchange VC labels. In this example, LSRA is indirectly connected to LSRC, so remote LDP sessions must be configured. The configuration roadmap is as follows:
- Configure OSPF between the LSRs to implement IP connectivity on the backbone network.
- Configure remote LDP sessions on LSRA and LSRC to exchange VC labels.
Procedure
- Configure IP addresses for interfaces.
# Configure LSRA. The configurations of LSRB and LSRC are similar to the configuration of LSRA, and are not mentioned here.
<Huawei> system-view [Huawei] sysname LSRA [LSRA] interface loopback 0 [LSRA-LoopBack0] ip address 10.10.1.1 32 [LSRA-LoopBack0] quit [LSRA] interface gigabitethernet 1/0/0 [LSRA-GigabitEthernet1/0/0] ip address 10.1.1.1 24 [LSRA-GigabitEthernet1/0/0] quit
- Configure OSPF to advertise the network segments connecting
to interfaces on each node and to advertise the routes of hosts with
LSR IDs.
# Configure LSRA. The configurations of LSRB and LSRC are similar to the configuration of LSRA, and are not mentioned here.
[LSRA] ospf 1 [LSRA-ospf-1] area 0 [LSRA-ospf-1-area-0.0.0.0] network 10.10.1.1 0.0.0.0 [LSRA-ospf-1-area-0.0.0.0] network 10.1.1.0 0.0.0.255 [LSRA-ospf-1-area-0.0.0.0] quit [LSRA-ospf-1] quit
- Enable global MPLS and MPLS LDP on LSRA and LSRC.
# Configure LSRA.
[LSRA] mpls lsr-id 10.10.1.1 [LSRA] mpls [LSRA-mpls] quit [LSRA] mpls ldp [LSRA-mpls-ldp] quit
# Configure LSRC.
[LSRC] mpls lsr-id 10.10.1.3 [LSRC] mpls [LSRC-mpls] quit [LSRC] mpls ldp [LSRC-mpls-ldp] quit
- Specify the name and IP address of the remote peer on the
two LSRs of a remote LDP session.
# Configure LSRA.
[LSRA] mpls ldp remote-peer lsrc [LSRA-mpls-ldp-remote-lsrc] remote-ip 10.10.1.3 [LSRA-mpls-ldp-remote-lsrc] quit
# Configure LSRC.
[LSRC] mpls ldp remote-peer lsra [LSRC-mpls-ldp-remote-lsra] remote-ip 10.10.1.1 [LSRC-mpls-ldp-remote-lsra] quit
- Verify the configuration.
# After the configuration is complete, run the display mpls ldp session command on the node. The command output shows that the status of the remote LDP session between LSRA and LSRC is Operational.
LSRA is used as an example.
[LSRA] display mpls ldp session LDP Session(s) in Public Network Codes: LAM(Label Advertisement Mode), SsnAge Unit(DDDD:HH:MM) A '*' before a session means the session is being deleted. ------------------------------------------------------------------------------ PeerID Status LAM SsnRole SsnAge KASent/Rcv ------------------------------------------------------------------------------ 10.10.1.3:0 Operational DU Passive 0000:00:01 6/6 ------------------------------------------------------------------------------ TOTAL: 1 session(s) Found.
# Run the display mpls ldp remote-peer command on the two LSRs of the remote LDP session to view information about the remote peer.
LSRA is used as an example.
[LSRA] display mpls ldp remote-peer LDP Remote Entity Information ------------------------------------------------------------------------------ Remote Peer Name: lsrc Remote Peer IP : 10.10.1.3 LDP ID : 10.10.1.1:0 Transport Address : 10.10.1.1 Entity Status : Active Configured Keepalive Hold Timer : 45 Sec Configured Keepalive Send Timer : ---- Configured Hello Hold Timer : 45 Sec Negotiated Hello Hold Timer : ---- Configured Hello Send Timer : 15 Sec Configured Delay Timer : 10 Sec Hello Packet sent/received : 6347/6307 Label Advertisement Mode : Downstream Unsolicited Remote Peer Deletion Status : No Auto-config : --- ------------------------------------------------------------------------------ TOTAL: 1 Peer(s) Found.
Configuration Files
LSRA configuration file
# sysname LSRA # mpls lsr-id 10.10.1.1 mpls # mpls ldp # mpls ldp remote-peer lsrc remote-ip 10.10.1.3 # interface GigabitEthernet1/0/0 ip address 10.1.1.1 255.255.255.0 # interface LoopBack0 ip address 10.10.1.1 255.255.255.255 # ospf 1 area 0.0.0.0 network 10.10.1.1 0.0.0.0 network 10.1.1.0 0.0.0.255 # returnLSRB configuration file
# sysname LSRB # interface GigabitEthernet1/0/0 ip address 10.1.1.2 255.255.255.0 # interface GigabitEthernet2/0/0 ip address 10.2.1.1 255.255.255.0 # interface LoopBack0 ip address 10.10.1.2 255.255.255.255 # ospf 1 area 0.0.0.0 network 10.10.1.2 0.0.0.0 network 10.1.1.0 0.0.0.255 network 10.2.1.0 0.0.0.255 # return
LSRC configuration file
# sysname LSRC # mpls lsr-id 10.10.1.3 mpls # mpls ldp # mpls ldp remote-peer lsra remote-ip 10.10.1.1 # interface GigabitEthernet1/0/0 ip address 10.2.1.2 255.255.255.0 # interface LoopBack0 ip address 10.10.1.3 255.255.255.255 # ospf 1 area 0.0.0.0 network 10.10.1.3 0.0.0.0 network 10.2.1.0 0.0.0.255 # return