Configuring LDP PW redundancy
Network requirements
Create two LDP PWs to implement PW redundancy between CE 1 and CE 2. The primary PW goes through PE 1—PE 2. The backup PW goes through PE 1—PE 3. When the primary PW fails, CE 1 and CE 2 communicate through the backup PW.
Figure 76: Network diagram
Table 25: Interface and IP address assignment
Device | Interface | IP address | Device | Interface | IP address |
|---|---|---|---|---|---|
PE 1 | Loop0 | 1.1.1.1/32 | PE 2 | Loop0 | 2.2.2.2/32 |
Vlan-int12 | 12.1.1.1/24 | Vlan-int12 | 12.1.1.2/24 | ||
Vlan-int13 | 13.1.1.1/24 | PE 3 | Loop0 | 3.3.3.3/32 | |
Vlan-int13 | 13.1.1.3/24 |
Configuration procedure
Before you perform the following configurations, configure VLANs and add ports to VLANs on switches.
Configure CE 1.
<CE1> system-view [CE1] interface ten-gigabitethernet 1/0/1 [CE1-Ten-GigabitEthernet1/0/1] port link-type trunk [CE1-Ten-GigabitEthernet1/0/1] port trunk permit vlan 10 [CE1-Ten-GigabitEthernet1/0/1] quit
Configure PE 1:
# Configure an LSR ID.
<PE1> system-view [PE1] interface loopback 0 [PE1-LoopBack0] ip address 1.1.1.1 32 [PE1-LoopBack0] quit [PE1] mpls lsr-id 1.1.1.1
# Enable global MPLS LDP.
[PE1] mpls ldp [PE1-ldp] quit
# Configure VLAN interface 12 (the interface connected to PE 2) and VLAN interface 13 (the interface connected to PE 3), and enable LDP for the interfaces.
[PE1] interface vlan-interface 12 [PE1-Vlan-interface12] ip address 12.1.1.1 24 [PE1-Vlan-interface12] mpls enable [PE1-Vlan-interface12] mpls ldp enable [PE1-Vlan-interface12] quit [PE1] interface vlan-interface 13 [PE1-Vlan-interface13] ip address 13.1.1.1 24 [PE1-Vlan-interface13] mpls enable [PE1-Vlan-interface13] mpls ldp enable [PE1-Vlan-interface13] quit
# Configure OSPF on PE 1 for LDP to create LSPs.
[PE1] ospf [PE1-ospf-1] area 0 [PE1-ospf-1-area-0.0.0.0] network 1.1.1.1 0.0.0.0 [PE1-ospf-1-area-0.0.0.0] network 12.1.1.0 0.0.0.255 [PE1-ospf-1-area-0.0.0.0] network 13.1.1.0 0.0.0.255 [PE1-ospf-1-area-0.0.0.0] quit [PE1-ospf-1] quit
# Enable L2VPN.
[PE1] l2vpn enable
# Create service instance 10 on Ten-GigabitEthernet 1/0/1 to match packets that have an outer VLAN ID of 10.
[PE1] interface ten-gigabitethernet1/0/1 [PE1-Ten-GigabitEthernet1/0/1] service-instance 10 [PE1-Ten-GigabitEthernet1/0/1-srv10] encapsulation s-vid 10 [PE1-Ten-GigabitEthernet1/0/1-srv10] quit [PE1-Ten-GigabitEthernet1/0/1] quit
# Create a cross-connect group named vpna, create a cross-connect named ldp in the group, and bind service instance 10 on Ten-GigabitEthernet 1/0/1 to the cross-connect.
[PE1] xconnect-group vpna [PE1-xcg-vpna] connection ldp [PE1-xcg-vpna-ldp] ac interface ten-gigabitethernet 1/0/1 service-instance 10
# Create primary and backup LDP PWs for the cross-connect to bind the AC to the PWs and implement PW redundancy.
[PE1-xcg-vpna-ldp] peer 2.2.2.2 pw-id 20 [PE1-xcg-vpna-ldp-2.2.2.2-20] backup-peer 3.3.3.3 pw-id 30 [PE1-xcg-vpna-ldp-3.3.3.3-30-backup] quit [PE1-xcg-vpna-ldp-2.2.2.2-20] quit [PE1-xcg-vpna-ldp] quit [PE1-xcg-vpna] quit [PE1] quit
Configure PE 2:
# Configure LSR ID.
<PE2> system-view [PE2] interface loopback 0 [PE2-LoopBack0] ip address 2.2.2.2 32 [PE2-LoopBack0] quit [PE2] mpls lsr-id 2.2.2.2
# Enable global MPLS LDP.
[PE2] mpls ldp [PE2-ldp] quit
# Configure VLAN interface 12 (the interface connected to PE 1), and enable LDP on it.
[PE2] interface vlan-interface 12 [PE2-Vlan-interface12] ip address 12.1.1.2 24 [PE2-Vlan-interface12] mpls enable [PE2-Vlan-interface12] mpls ldp enable [PE2-Vlan-interface12] quit
# Configure OSPF on PE 2 for LDP to create LSPs.
[PE2] ospf [PE2-ospf-1] area 0 [PE2-ospf-1-area-0.0.0.0] network 12.1.1.0 0.0.0.255 [PE2-ospf-1-area-0.0.0.0] network 2.2.2.2 0.0.0.0 [PE2-ospf-1-area-0.0.0.0] quit [PE2-ospf-1] quit
# Enable L2VPN.
[PE2] l2vpn enable
# Create service instance 10 on Ten-GigabitEthernet 1/0/1 to match packets that have an outer VLAN ID of 10.
[PE2] interface ten-gigabitethernet1/0/1 [PE2-Ten-GigabitEthernet1/0/1] service-instance 10 [PE2-Ten-GigabitEthernet1/0/1-srv10] encapsulation s-vid 10 [PE2-Ten-GigabitEthernet1/0/1-srv10] quit [PE2-Ten-GigabitEthernet1/0/1] quit
# Create a cross-connect group named vpna, create a cross-connect named ldp in the group, and bind service instance 10 on Ten-GigabitEthernet 1/0/1 to the cross-connect.
[PE2] xconnect-group vpna [PE2-xcg-vpna] connection ldp [PE2-xcg-vpna-ldp] ac interface ten-gigabitethernet 1/0/1 service-instance 10
# Create an LDP PW for the cross-connect to bind the AC to the PW.
[PE2-xcg-vpna-ldp] peer 1.1.1.1 pw-id 20 [PE2-xcg-vpna-ldp-1.1.1.1-20] quit [PE2-xcg-vpna-ldp] quit [PE2-xcg-vpna] quit
Configure PE 3:
# Configure an LSR ID.
<PE3> system-view [PE3] interface loopback 0 [PE3-LoopBack0] ip address 3.3.3.3 32 [PE3-LoopBack0] quit [PE3] mpls lsr-id 3.3.3.3
# Enable global MPLS LDP.
[PE3] mpls ldp [PE3-ldp] quit
# Configure VLAN interface 13 (the interface connected to PE 1), and enable LDP on it.
[PE3] interface vlan-interface 13 [PE3-Vlan-interface13] ip address 13.1.1.3 24 [PE3-Vlan-interface13] mpls enable [PE3-Vlan-interface13] mpls ldp enable [PE3-Vlan-interface13] quit
# Configure OSPF on PE 3 for LDP to create LSPs.
[PE3] ospf [PE3-ospf-1] area 0 [PE3-ospf-1-area-0.0.0.0] network 13.1.1.0 0.0.0.255 [PE3-ospf-1-area-0.0.0.0] network 3.3.3.3 0.0.0.0 [PE3-ospf-1-area-0.0.0.0] quit [PE3-ospf-1] quit
# Enable L2VPN.
[PE3] l2vpn enable
# Create service instance 10 on Ten-GigabitEthernet 1/0/1 to match packets that have an outer VLAN ID of 10.
[PE3] interface ten-gigabitethernet1/0/1 [PE3-Ten-GigabitEthernet1/0/1] service-instance 10 [PE3-Ten-GigabitEthernet1/0/1-srv10] encapsulation s-vid 10 [PE3-Ten-GigabitEthernet1/0/1-srv10] quit [PE3-Ten-GigabitEthernet1/0/1] quit
# Create a cross-connect group named vpna, create a cross-connect named ldp in the group, and bind service instance 10 on Ten-GigabitEthernet 1/0/1 to the cross-connect.
[PE3] xconnect-group vpna [PE3-xcg-vpna] connection ldp [PE3-xcg-vpna-ldp] ac interface ten-gigabitethernet 1/0/1 service-instance 10
# Create an LDP PW for the cross-connect to bind the AC to the PW.
[PE3-xcg-vpna-ldp] peer 1.1.1.1 pw-id 30 [PE3-xcg-vpna-ldp-1.1.1.1-30] quit [PE3-xcg-vpna-ldp] quit [PE3-xcg-vpna] quit
Configure CE 2.
<CE2> system-view [CE2] interface ten-gigabitethernet 1/0/1 [CE2-Ten-GigabitEthernet1/0/1] port link-type trunk [CE2-Ten-GigabitEthernet1/0/1] port trunk permit vlan 10 [CE2-Ten-GigabitEthernet1/0/1] quit [CE2] interface ten-gigabitethernet 1/0/2 [CE2-Ten-GigabitEthernet1/0/2] port link-type trunk [CE2-Ten-GigabitEthernet1/0/2] port trunk permit vlan 10 [CE2-Ten-GigabitEthernet1/0/2] quit
Verifying the configuration
# Display L2VPN PW information on PE 1. The output shows that two LDP PWs have been established.
<PE1> display l2vpn pw Flags: M - main, B - backup, H - hub link, S - spoke link, N - no split horizon Total number of PWs: 2, 1 up, 1 blocked, 0 down, 0 defect Xconnect-group Name: vpna Peer PW ID In/Out Label Proto Flag Link ID State 2.2.2.2 20 65651/65779 LDP M 1 Up 3.3.3.3 30 65650/65779 LDP B 1 Blocked
# Display detailed information about the primary and backup PWs on PE 1.
<PE1> display l2vpn pw verbose
Xconnect-group Name: vpna
Connection: ldp
Peer: 2.2.2.2 PW ID: 20
Signaling Protocol : LDP
Link ID : 1 PW State : Up
In Label : 65651 Out Label: 65779
Wait to Restore Time: 0 sec
MTU : 1500
PW Attributes : Main
VCCV CC : -
VCCV BFD : -
Tunnel Group ID : 0x1800000260000002
Tunnel NHLFE IDs : 135
Peer: 3.3.3.3 PW ID: 30
Signaling Protocol : LDP
Link ID : 1 PW State : Blocked
In Label : 65650 Out Label: 65779
MTU : 1500
PW Attributes : Backup
VCCV CC : -
VCCV BFD : -
Tunnel Group ID : 0x1800000360000003
Tunnel NHLFE IDs : 137
# Display L2VPN PW information on PE 2. The output shows that an LDP PW has been established.
[PE2] display l2vpn pw Flags: M - main, B - backup, H - hub link, S - spoke link, N - no split horizon Total number of PWs: 1, 1 up, 0 blocked, 0 down, 0 defect Xconnect-group Name: vpna Peer PW ID In/Out Label Proto Flag Link ID State 1.1.1.1 20 65779/65651 LDP M 1 Up
# Display L2VPN PW information on PE 3. The output shows that an LDP PW has been established.
[PE3] display l2vpn pw Flags: M - main, B - backup, H - hub link, S - spoke link, N - no split horizon Total number of PWs: 1, 1 up, 0 blocked, 0 down, 0 defect Xconnect-group Name: vpna Peer PW ID In/Out Label Proto Flag Link ID State 1.1.1.1 30 65779/65650 LDP M 1 Up
# Verify that CE 1 and CE 2 can ping each other. (Details not shown.)
# Manually switch to the backup PW on PE 1.
<PE1> l2vpn switchover peer 2.2.2.2 pw-id 20
# Display L2VPN PW information on PE 1. The output shows that the PW switchover is successful.
<PE1> display l2vpn pw Flags: M - main, B - backup, H - hub link, S - spoke link, N - no split horizon Total number of PWs: 2, 1 up, 1 blocked, 0 down, 0 defect Xconnect-group Name: vpna Peer PW ID In/Out Label Proto Flag Link ID State 2.2.2.2 20 65651/65779 LDP M 1 Blocked 3.3.3.3 30 65650/65779 LDP B 1 Up
# Verify that CE 1 and CE 2 can ping each other. (Details not shown.)