Click the Exhibit button.
[edit]
user@PE-1# run show l2 circuit 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 bitrare
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 XX – – unknown
Legend for interface status
Up – – operational
Dn – – down
Neighbor: 4.4.4.4
Interface Type St Time
last up #Up trans
ge-0/0/1.512 (vc 1) rmt OL
[edit]
user@PE-1# show protocols ldp
interface ge-0/0/2.0;
[edit]
user@PE-1# show protocols l2circuit
neighbor 4.4.4.4 {
interface ge-0/0/1.512 {
virtual-circuit-id 1
}
}
[edit]
user@PE-1# show interfaces ge-0/0/1
vlan-tagging;
encapsulation vlan-ccc;
unit 512 {
encapsulation vlan-ccc;
vlan-id 512;
}[edit]
uxer@P-1 # show protocols ldp
interface all;
[edit]
user@P-2# show protocols ldp
interface all;
[edit]
user@PE-2# 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
Psewdowire
LD – – Local site signaled down RS – – remote
site standby
RD – – remote site signaled down XX – – unknown
Legend for interface status
UP – – operational
DN – – down
Neighbor: 1.1.1.1
Interface Type St Time
last up #Up trans
ge-0/0/1.512 (vc 1) rmt OL
[edit]
user@PE-2# show protocols ldp
interface ge-0/0/2.0;
[edit]
user@PE-2# show protocols l2circuit
neighbor 1.1.1.1 {
interface ge-0/0/1.512 {
virtual-circuit-id 1;
}
}
[edit]
user@PE-2# show interfaces ge-0/0/1vlan-tagging;
encapsulation vlan-ccc;
unit 512 {
encapsulation vlan-ccc;
vlan-id 512;
}
Referring to the exhibit, you have configured an L2 circuit that connects Site-1 and Site-2, but the L2 circuit is
not functioning. The topology in this scenario is shown below.
Site-1 > PE-1 > P-1 > P-2 > PE-2 Site-2
Which action will allow communication between Site-1 and Site-2?

A.
Change the virtual circuit identifier to 2 for PE-2.

B.
Add the family inet statement under the ge-0/0/1.512 interface for PE-1 and PE-2.

C.
Add the lo0 interface under the {edit protocols ldp} hierarchy for all routers.

D.
Add the lo0 interface under the {edit protocols 12circuit} hierarchy for PE-1 and PE-2

Explanation:
LDP is required as the signaling protocol for Layer 2 circuits. You must include the loopback address in LDP.
We enable ldp on the loopback interfaces.
Incorrect Answers:
A: The virtual circuit identifíer is correctly set to 1 both at PE-1 and PE-2.
https://www.juniper.net/techpubs/en_US/junos12.3/topics/example/layer-two-circuits-ethernetconfiguring-detailed-solutions.html