Configuring an intra-domain multi-segment PW

As shown in Figure 115, there is no public tunnel between PE 1 and PE 2. There is an MPLS TE tunnel between PE 1 and P, and an MPLS TE tunnel between P and PE 2.

Configure a multi-segment PW within the backbone to allow communication between CE 1 and CE 2. The multi-segment PW includes an LDP PW between PE 1 and P, and a static PW between P and PE 2. The two PWs are concatenated on P.

1. Configure CE 1.

   <CE1> system-view
   [CE1] interface gigabitethernet 2/1/1
   [CE1-GigabitEthernet2/1/1] ip address 100.1.1.1 24
   [CE1-GigabitEthernet2/1/1] quit
   

2. Configure PE 1:

   # Configure an LSR ID.

   <PE1> system-view
   [PE1] interface loopback 0
   [PE1-LoopBack0] ip address 192.2.2.2 32
   [PE1-LoopBack0] quit
   [PE1] mpls lsr-id 192.2.2.2
   

   # Enable L2VPN.

   [PE1] l2vpn enable
   

   # Enable LDP globally.

   [PE1] mpls ldp
   [PE1-ldp] quit
   

   # Configure MPLS TE to establish an MPLS TE tunnel between PE 1 and P. For more information, see "Configuring MPLS TE."

   # Create a cross-connect group named vpn1, create a cross-connect named ldp in the group, and bind GigabitEthernet 2/1/1 to the cross-connect.

   [PE1] xconnect-group vpn1
   [PE1-xcg-vpn1] connection ldp
   [PE1-xcg-vpn1-ldp] ac interface gigabitethernet 2/1/1
   

   # Create an LDP PW for the cross-connect to bind the AC to the PW.

   [PE1-xcg-vpn1-ldp] peer 192.4.4.4 pw-id 1000
   [PE1-xcg-vpn1-ldp-192.4.4.4-1000] quit
   [PE1-xcg-vpn1-ldp] quit
   [PE1-xcg-vpn1] quit
   

3. Configure the P device:

   # Configure an LSR ID.

   <P> system-view
   [P] interface loopback 0
   [P-LoopBack0] ip address 192.4.4.4 32
   [P-LoopBack0] quit
   [P] mpls lsr-id 192.4.4.4
   

   # Enable L2VPN.

   [P] l2vpn enable
   

   # Enable LDP globally.

   [P] mpls ldp
   [P-ldp] quit
   

   # Create a PW class named pwa, and configure the PW data encapsulation type as ethernet.

   [P] pw-class pwa
   [P-pw-pwa] pw-type ethernet
   [P-pw-pwa] quit
   

   # Configure MPLS TE to establish an MPLS TE tunnel between PE 1 and P, and between P and PE 2. For more information, see "Configuring MPLS TE."

   # Create a cross-connect group named vpn1, create a cross-connect named ldpsvc in the group, and create an LDP PW and a static PW for the cross-connect to form a multi-segment PW.

   [P] xconnect-group vpn1
   [P-xcg-vpn1] connection ldpsvc
   [P-xcg-vpn1-ldpsvc] peer 192.2.2.2 pw-id 1000 pw-class pwa
   [P-xcg-vpn1-ldpsvc-192.2.2.2-1000] quit
   [P-xcg-vpn1-ldpsvc] peer 192.3.3.3 pw-id 1000 in-label 100 out-label 200 pw-class pwa
   [P-xcg-vpn1-ldpsvc-192.3.3.3-1000] quit
   [P-xcg-vpn1-ldpsvc] quit
   [P-xcg-vpn1] quit
   

4. Configure PE 2:

   # Configure an LSR ID.

   <PE2> system-view
   [PE2] interface loopback 0
   [PE2-LoopBack0] ip address 192.3.3.3 32
   [PE2-LoopBack0] quit
   [PE2] mpls lsr-id 192.3.3.3
   

   # Enable L2VPN.

   [PE2] l2vpn enable
   

   # Configure MPLS TE to establish an MPLS TE tunnel between P and PE 2. For more information, see "Configuring MPLS TE."

   # Create a cross-connect group named vpn1, create a cross-connect named svc in the group, and bind GigabitEthernet 2/1/1 to the cross-connect.

   [PE2] xconnect-group vpn1
   [PE2-xcg-vpn1] connection svc
   [PE2-xcg-vpn1-svc] ac interface gigabitethernet 2/1/1
   

   # Create a static PW for the cross-connect to bind the AC to the PW.

   [PE2-xcg-vpn1-svc] peer 192.4.4.4 pw-id 1000 in-label 200 out-label 100
   [PE2-xcg-vpn1-svc-192.4.4.4-1000] quit
   [PE2-xcg-vpn1-svc] quit
   [PE2-xcg-vpn1] quit
   

5. Configure CE 2.

   <CE2> system-view
   [CE2] interface gigabitethernet 2/1/1
   [CE2-GigabitEthernet2/1/1] ip address 100.1.1.2 24
   [CE2-GigabitEthernet2/1/1] quit
   

# Verify that two PWs have been created to form a multi-segment PW on the P device.

[P] display l2vpn pw
Flags: M - main, B - backup, BY - bypass, H - hub link, S - spoke link, N - no split horizon
Total number of PWs: 2
2 up, 0 blocked, 0 down, 0 defect, 0 idle, 0 duplicate

Xconnect-group Name: vpn1
Peer            PW ID/Rmt Site    In/Out Label    Proto  Flag  Link ID    State
192.2.2.2       1000              1279/1150       LDP    M     0          Up
192.3.3.3       1000              100/200         Static M     1          Up

# Verify that a PW has been created on PE 1.

[PE1] display l2vpn pw
Flags: M - main, B - backup, BY - bypass, H - hub link, S - spoke link, N - no split horizon
Total number of PWs: 1
1 up, 0 blocked, 0 down, 0 defect, 0 idle, 0 duplicate

Xconnect-group Name: vpn1
Peer            PW ID/Rmt Site    In/Out Label    Proto  Flag  Link ID    State
192.4.4.4       1000              1150/1279       LDP    M     1          Up

# Verify that a PW has been created on PE 2.

[PE2] display l2vpn pw
Flags: M - main, B - backup, BY - bypass, H - hub link, S - spoke link, N - no split horizon
Total number of PWs: 1
1 up, 0 blocked, 0 down, 0 defect, 0 idle, 0 duplicate

Xconnect-group Name: vpn1
Peer            PW ID/Rmt Site    In/Out Label    Proto  Flag  Link ID    State
192.4.4.4       1000              200/100         Static M     1          Up

# Verify that CE 1 and CE 2 can ping each other. (Details not shown.)