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[MX] Example: Configuring l2circuit with a backup neighbor that has the same virtual-circuit-id

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Article ID: KB35250 KB Last Updated: 10 Dec 2019Version: 1.0
Summary:

This article provides an example of configuring l2circuit with a backup neighbor that has the same virtual-circuit-id.

Note: Having the same virtual-circuit-id does not necessarily cause any behavior change but could contribute to ease of troubleshooting.

Solution:

Topology

In the above topology:

  • On one end is the customer device that is connected to a provider edge (PE) device

  • On the other end, the other customer edge (CE) device is connected to two PE devices via the switch for redundancy with the primary and backup connections.

 

The CE and PE device configurations for availing of l2circuit services are as follows:

CE1 configuration

set interfaces ge-1/2/0 unit 0 family inet address 12.0.0.1/24
set interfaces lo0 unit 1 family inet address 1.1.1.1/32

CE2 configuration

set interfaces ge-1/3/5 unit 0 family inet address 12.0.0.2/24
set interfaces lo0 unit 7 family inet address 7.7.7.7/32 

P12 configuration

set P12 interfaces ge-1/2/3 unit 0 family inet address 23.0.0.3/24
set P12 interfaces ge-1/2/3 unit 0 family mpls
set P12 interfaces ge-1/2/4 unit 0 family inet address 34.0.0.3/24
set P12 interfaces ge-1/2/4 unit 0 family mpls
set P12 interfaces lo0 unit 3 family inet address 3.3.3.3/32
set P12 interfaces lo0 unit 3 family mpls
set P12 protocols mpls interface ge-1/2/3.0
set P12 protocols mpls interface ge-1/2/4.0
set P12 protocols mpls interface lo0.3
set P12 protocols ospf area 0.0.0.0 interface ge-1/2/3.0
set P12 protocols ospf area 0.0.0.0 interface ge-1/2/4.0
set P12 protocols ospf area 0.0.0.0 interface lo0.3
set P12 protocols ldp interface ge-1/2/3.0
set P12 protocols ldp interface ge-1/2/4.0
set P12 protocols ldp interface lo0.3

P13 configuration

set P13 interfaces ge-1/2/7 unit 0 family inet address 25.0.0.5/24
set P13 interfaces ge-1/2/7 unit 0 family mpls
set P13 interfaces ge-1/2/8 unit 0 family inet address 56.0.0.5/24
set P13 interfaces ge-1/2/8 unit 0 family mpls
set P13 interfaces lo0 unit 5 family inet address 5.5.5.5/32
set P13 interfaces lo0 unit 5 family mpls
set P13 protocols mpls interface ge-1/2/7.0
set P13 protocols mpls interface ge-1/2/8.0
set P13 protocols mpls interface lo0.5
set P13 protocols ospf area 0.0.0.0 interface ge-1/2/7.0
set P13 protocols ospf area 0.0.0.0 interface ge-1/2/8.0
set P13 protocols ospf area 0.0.0.0 interface lo0.5
set P13 protocols ldp interface ge-1/2/7.0
set P13 protocols ldp interface ge-1/2/8.0
set P13 protocols ldp interface lo0.5 

PE1 configuration

set interfaces ge-1/2/1 encapsulation ethernet-ccc
set interfaces ge-1/2/1 unit 0
set interfaces ge-1/2/2 unit 0 family inet address 23.0.0.2/24
set interfaces ge-1/2/2 unit 0 family mpls
set interfaces ge-1/2/6 unit 0 family inet address 25.0.0.2/24
set interfaces ge-1/2/6 unit 0 family mpls
set interfaces lo0 unit 2 family inet address 2.2.2.2/32
set interfaces lo0 unit 2 family mpls
set protocols mpls interface ge-1/2/2.0
set protocols mpls interface ge-1/2/6.0
set protocols mpls interface lo0.2
set protocols ospf area 0.0.0.0 interface ge-1/2/2.0
set protocols ospf area 0.0.0.0 interface lo0.2
set protocols ospf area 0.0.0.0 interface ge-1/2/6.0
set protocols ldp interface ge-1/2/2.0
set protocols ldp interface ge-1/2/6.0
set protocols ldp interface lo0.2
 
set protocols l2circuit neighbor 4.4.4.4 interface ge-1/2/1.0 virtual-circuit-id 3
set protocols l2circuit neighbor 4.4.4.4 interface ge-1/2/1.0 encapsulation-type ethernet
set protocols l2circuit neighbor 4.4.4.4 interface ge-1/2/1.0 ignore-encapsulation-mismatch
set protocols l2circuit neighbor 4.4.4.4 interface ge-1/2/1.0 ignore-mtu-mismatch
set protocols l2circuit neighbor 4.4.4.4 interface ge-1/2/1.0 revert-time 30
set protocols l2circuit neighbor 4.4.4.4 interface ge-1/2/1.0 backup-neighbor 6.6.6.6 

PE2 configuration

set interfaces ge-1/3/0 encapsulation ethernet-ccc
set interfaces ge-1/2/5 unit 0 family inet address 34.0.0.4/24
set interfaces ge-1/2/5 unit 0 family mpls
set interfaces ge-1/3/0 unit 0
set interfaces lo0 unit 4 family inet address 4.4.4.4/32
set interfaces lo0 unit 4 family mpls
set protocols mpls interface ge-1/2/5.0
set protocols mpls interface lo0.4
set protocols ospf area 0.0.0.0 interface ge-1/2/5.0
set protocols ospf area 0.0.0.0 interface lo0.4
set protocols ldp interface ge-1/2/5.0
set protocols ldp interface lo0.4
set protocols l2circuit neighbor 2.2.2.2 interface ge-1/3/0.0 virtual-circuit-id 3
set protocols l2circuit neighbor 2.2.2.2 interface ge-1/3/0.0 encapsulation-type ethernet
set protocols l2circuit neighbor 2.2.2.2 interface ge-1/3/0.0 ignore-encapsulation-mismatch
set protocols l2circuit neighbor 2.2.2.2 interface ge-1/3/0.0 ignore-mtu-mismatch
set protocols l2circuit neighbor 2.2.2.2 interface ge-1/3/0.0 revert-time 30

PE3 configuration

set interfaces ge-1/3/2 encapsulation ethernet-ccc
set interfaces ge-1/2/9 unit 0 family inet address 56.0.0.6/24
set interfaces ge-1/2/9 unit 0 family mpls
set interfaces ge-1/3/2 unit 0
set interfaces lo0 unit 6 family inet address 6.6.6.6/32
set interfaces lo0 unit 6 family mpls
set protocols mpls interface ge-1/2/9.0
set protocols mpls interface lo0.6
set protocols ospf area 0.0.0.0 interface lo0.6
set protocols ospf area 0.0.0.0 interface ge-1/2/9.0
set protocols ldp interface ge-1/2/9.0
set protocols ldp interface lo0.6
set protocols l2circuit neighbor 2.2.2.2 interface ge-1/3/2.0 virtual-circuit-id 3
set protocols l2circuit neighbor 2.2.2.2 interface ge-1/3/2.0 encapsulation-type ethernet
set protocols l2circuit neighbor 2.2.2.2 interface ge-1/3/2.0 ignore-encapsulation-mismatch
set protocols l2circuit neighbor 2.2.2.2 interface ge-1/3/2.0 ignore-mtu-mismatch
set protocols l2circuit neighbor 2.2.2.2 interface ge-1/3/2.0 revert-time 30 

SW configuration

set bridge-domains PW-B domain-type bridge
set bridge-domains PW-B interface ge-1/3/1.0
set bridge-domains PW-B interface ge-1/3/3.0
set bridge-domains PW-B interface ge-1/3/4.0
set interfaces ge-1/3/1 encapsulation ethernet-bridge
set interfaces ge-1/3/1 unit 0 family bridge
set interfaces ge-1/3/3 encapsulation ethernet-bridge
set interfaces ge-1/3/3 unit 0 family bridge
set interfaces ge-1/3/4 encapsulation ethernet-bridge
set interfaces ge-1/3/4 unit 0 family bridge 

Results and Verification

We can verify the l2circuit connection status by using the command show l2circuit connection for both the primary and secondary neighbors. The primary will show the status as UP whereas the backup neighbor will show as BK (Backup).

PE1

user@PE1> show l2circuit connections
Layer-2 Circuit Connections:
 
Legend for connection status (St)
EI -- encapsulation invalid      NP -- interface h/w not present
MM -- mtu mismatch               Dn -- down
EM -- encapsulation mismatch     VC-Dn -- Virtual circuit Down
CM -- control-word mismatch      Up -- operational
VM -- vlan id mismatch           CF -- Call admission control failure
OL -- no outgoing label          IB -- TDM incompatible bitrate
NC -- intf encaps not CCC/TCC    TM -- TDM misconfiguration
BK -- Backup Connection          ST -- Standby Connection
CB -- rcvd cell-bundle size bad  SP -- Static Pseudowire
LD -- local site signaled down   RS -- remote site standby
RD -- remote site signaled down  HS -- Hot-standby Connection
XX -- unknown
 
Legend for interface status
Up -- operational
Dn -- down
Neighbor: 4.4.4.4
    Interface                 Type  St     Time last up          # Up trans
    ge-1/2/1.0(vc 3)          rmt   Up     Nov  4 13:43:10 2019           1
      Remote PE: 4.4.4.4, Negotiated control-word: Yes (Null)
      Incoming label: 299936, Outgoing label: 299776
      Negotiated PW status TLV: No
      Local interface: ge-1/2/1.0, Status: Up, Encapsulation: ETHERNET
      Flow Label Transmit: No, Flow Label Receive: No
Neighbor: 6.6.6.6
    Interface                 Type  St     Time last up          # Up trans
    ge-1/2/1.0(vc 3)          rmt   BK

After disabling and enabling interface ge-1/2/5 on PE2 a couple of times and checking for continuous ping on another session, no packet drops were observed:

PE2

user@PE2# set interfaces ge-1/2/5 disable
 
user@PE2# show | compare
[edit interfaces]
+   ge-1/2/5 {
+       disable;
+   }
 
user@PE2# commit
commit complete
 
user@PE2# rollback 1
load complete
 
user@PE2show | compare
[edit interfaces]
-   ge-1/2/5 {
-       disable;
-   }
 
[edit]
user@PE2# commit
commit complete

When the primary link or neighbor is down, the backup neighbor will come up quickly and traffic will start flowing on the backup link. In this condition, the status of the primary connection will show as "OL" (no outgoing label), which is expected because no labels are received from the primary neighbor to forward traffic. The backup connection will show state as "UP."

PE1

user@PE1# run show l2circuit connections 
Layer-2 Circuit Connections:
 
Legend for connection status (St)
EI -- encapsulation invalid      NP -- interface h/w not present
MM -- mtu mismatch               Dn -- down
EM -- encapsulation mismatch     VC-Dn -- Virtual circuit Down
CM -- control-word mismatch      Up -- operational
VM -- vlan id mismatch           CF -- Call admission control failure
OL -- no outgoing label          IB -- TDM incompatible bitrate
NC -- intf encaps not CCC/TCC    TM -- TDM misconfiguration
BK -- Backup Connection          ST -- Standby Connection
CB -- rcvd cell-bundle size bad  SP -- Static Pseudowire
LD -- local site signaled down   RS -- remote site standby
RD -- remote site signaled down  HS -- Hot-standby Connection
XX -- unknown
 
Legend for interface status
Up -- operational
Dn -- down
Neighbor: 4.4.4.4
    Interface                 Type  St     Time last up          # Up trans
    ge-1/2/1.0(vc 3)          rmt   OL
Neighbor: 6.6.6.6
    Interface                 Type  St     Time last up          # Up trans
    ge-1/2/1.0(vc 3)          rmt   Up     Nov  4 14:04:10 2019           1
      Remote PE: 6.6.6.6, Negotiated control-word: Yes (Null)
      Incoming label: 300016, Outgoing label: 299776
      Negotiated PW status TLV: No
      Local interface: ge-1/2/1.0, Status: Up, Encapsulation: ETHERNET
      Flow Label Transmit: No, Flow Label Receive: No
 
user@PE1# run show l2circuit connections 
Layer-2 Circuit Connections:
 
Legend for connection status (St)
EI -- encapsulation invalid      NP -- interface h/w not present
MM -- mtu mismatch               Dn -- down
EM -- encapsulation mismatch     VC-Dn -- Virtual circuit Down
CM -- control-word mismatch      Up -- operational
VM -- vlan id mismatch           CF -- Call admission control failure
OL -- no outgoing label          IB -- TDM incompatible bitrate
NC -- intf encaps not CCC/TCC    TM -- TDM misconfiguration
BK -- Backup Connection          ST -- Standby Connection
CB -- rcvd cell-bundle size bad  SP -- Static Pseudowire
LD -- local site signaled down   RS -- remote site standby
RD -- remote site signaled down  HS -- Hot-standby Connection
XX -- unknown
 
Legend for interface status
Up -- operational
Dn -- down
Neighbor: 4.4.4.4
    Interface                 Type  St     Time last up          # Up trans
    ge-1/2/1.0(vc 3)          rmt   Up     Nov  4 14:11:04 2019           1
      Remote PE: 4.4.4.4, Negotiated control-word: Yes (Null)
      Incoming label: 300048, Outgoing label: 299776
      Negotiated PW status TLV: No
      Local interface: ge-1/2/1.0, Status: Up, Encapsulation: ETHERNET
      Flow Label Transmit: No, Flow Label Receive: No
Neighbor: 6.6.6.6
    Interface                 Type  St     Time last up          # Up trans
    ge-1/2/1.0(vc 3)          rmt   BK
 
user@PE1# run show l2circuit connections 
Nov 04 14:14:17
Layer-2 Circuit Connections:
 
Legend for connection status (St)
EI -- encapsulation invalid      NP -- interface h/w not present
MM -- mtu mismatch               Dn -- down
EM -- encapsulation mismatch     VC-Dn -- Virtual circuit Down
CM -- control-word mismatch      Up -- operational
VM -- vlan id mismatch           CF -- Call admission control failure
OL -- no outgoing label          IB -- TDM incompatible bitrate
NC -- intf encaps not CCC/TCC    TM -- TDM misconfiguration
BK -- Backup Connection          ST -- Standby Connection
CB -- rcvd cell-bundle size bad  SP -- Static Pseudowire
LD -- local site signaled down   RS -- remote site standby
RD -- remote site signaled down  HS -- Hot-standby Connection
XX -- unknown
 
Legend for interface status
Up -- operational
Dn -- down
Neighbor: 4.4.4.4
    Interface                 Type  St     Time last up          # Up trans
    ge-1/2/1.0(vc 3)          rmt   OL
Neighbor: 6.6.6.6
    Interface                 Type  St     Time last up          # Up trans
    ge-1/2/1.0(vc 3)          rmt   Up     Nov  4 14:12:36 2019           1
      Remote PE: 6.6.6.6, Negotiated control-word: Yes (Null)
      Incoming label: 300064, Outgoing label: 299776
      Negotiated PW status TLV: No
      Local interface: ge-1/2/1.0, Status: Up, Encapsulation: ETHERNET
      Flow Label Transmit: No, Flow Label Receive: No

Parallel Monitoring on Another Window

user@PE1> ping 12.0.0.2
64 bytes from 12.0.0.2: icmp_seq=366 ttl=64 time=4.644 ms
64 bytes from 12.0.0.2: icmp_seq=367 ttl=64 time=27.053 ms
64 bytes from 12.0.0.2: icmp_seq=368 ttl=64 time=0.935 ms
64 bytes from 12.0.0.2: icmp_seq=369 ttl=64 time=1.164 ms
 <snip>
 
64 bytes from 12.0.0.2: icmp_seq=370 ttl=64 time=0.934 ms
64 bytes from 12.0.0.2: icmp_seq=371 ttl=64 time=0.915 ms
64 bytes from 12.0.0.2: icmp_seq=372 ttl=64 time=0.926 ms
64 bytes from 12.0.0.2: icmp_seq=373 ttl=64 time=0.905 ms
64 bytes from 12.0.0.2: icmp_seq=374 ttl=64 time=0.935 ms
64 bytes from 12.0.0.2: icmp_seq=375 ttl=64 time=0.893 ms
64 bytes from 12.0.0.2: icmp_seq=376 ttl=64 time=2.198 ms
64 bytes from 12.0.0.2: icmp_seq=377 ttl=64 time=1.242 ms
64 bytes from 12.0.0.2: icmp_seq=378 ttl=64 time=0.904 ms
64 bytes from 12.0.0.2: icmp_seq=379 ttl=64 time=0.872 ms
64 bytes from 12.0.0.2: icmp_seq=380 ttl=64 time=0.901 ms
64 bytes from 12.0.0.2: icmp_seq=381 ttl=64 time=0.938 ms
64 bytes from 12.0.0.2: icmp_seq=382 ttl=64 time=0.924 ms
64 bytes from 12.0.0.2: icmp_seq=383 ttl=64 time=0.903 ms
64 bytes from 12.0.0.2: icmp_seq=384 ttl=64 time=0.904 ms
64 bytes from 12.0.0.2: icmp_seq=385 ttl=64 time=0.902 ms
64 bytes from 12.0.0.2: icmp_seq=386 ttl=64 time=0.936 ms
64 bytes from 12.0.0.2: icmp_seq=387 ttl=64 time=0.895 ms
64 bytes from 12.0.0.2: icmp_seq=388 ttl=64 time=0.930 ms
64 bytes from 12.0.0.2: icmp_seq=389 ttl=64 time=0.885 ms
^C
--- 12.0.0.2 ping statistics ---
390 packets transmitted, 389 packets received, 0% packet loss
round-trip min/avg/max/stddev = 0.752/1.800/32.411/3.424 ms

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