Physical Network Topology
Figure 1-1 VLL Not Up
Fault Description
VLL services are deployed on the customer's network. A point-to-point VLL is deployed on CSG1_ATN950B and ASG1_CX600. The VLL fails to go Up.
Configuration Files
ATN:
#
mpls lsr-id 1.1.1.145
mpls
mpls ldp
mpls l2vpn
#
isis 10
is-level level-2
cost-style wide
network-entity 49.0002.0030.0300.3003.00
timer spf 1 50 1
log-peer-change
set-overload on-startup
#
interface loopback 0
ip address 1.1.1.145 32
isis enable
interface gi 0/3/2.1
vlan-type dot1q 1
ip address 1.1.1.1 30
mpls ldp
isis enable 10
#
interface GigabitEthernet 0/1/7.50
vlan-type dot1q 50
mpls l2vc 1.1.1.144 100 raw
#
CX600:
#
mpls lsr-id 1.1.1.144
mpls
mpls ldp
mpls l2vpn
#
isis 10
is-level level-2
cost-style wide
network-entity 49.0002.0030.0400.3003.00
timer spf 1 50 1
log-peer-change
set-overload on-startup
#
interface loopback 0
ip address 1.1.1.144 32
isis enable
interface gi 0/3/2.1
vlan-type dot1q 1
ip address 1.1.1.2 30
mpls ldp
isis enable 10
#
interface GigabitEthernet 3/0/1.50
vlan-type dot1q 50
mpls l2vc 1.1.1.145 100
#
Troubleshooting Procedure
Step 1 Log in to the CSG1_ATN950B and find that the VLL is Down.
<CSG1_ATN950B>
display mpls l2vc interface GigabitEthernet 0/1/7.50
*client interface : GigabitEthernet0/1/7.50
is up
Administrator PW : no
session state : up
AC status : up
VC state :
down
Step 2 Log in to the devices at both ends to check the encapsulation types at both ends of the VLL. It is found that the encapsulation types of the two ends are different.
<RSG1_CX600>
display mpls l2vc interface GigabitEthernet 1/1/1.50 brief
Total LDP VC : 1 0
up 1 down
*Client Interface : GigabitEthernet1/1/1.50
Administrator PW : no
AC status :
up
VC
State :
down
Label state : 0
Token state : 0
VC
ID
: 100
VC
Type
: Ethernet
session state : up
Destination : 1.1.1.145
link state : down
<CSG1_ATN950B>
display mpls l2vc interface GigabitEthernet 0/1/7.50 brief
Total LDP VC : 1 0
up 1 down
*Client Interface : GigabitEthernet0/1/7.50
Administrator PW : no
AC status :
up
VC
State :
down
Label state : 0
Token state : 0
VC
ID
: 100
VC
Type
: VLAN
session state : up
Destination : 1.1.1.144
link state : down
Step 3 Modify the configuration to make the encapsulation mode of the two ends are consistent.
[CSG1_ATN950B-GigabitEthernet0/1/7.50]
undo mpls l2vc 1.1.1.144 100
[CSG1_ATN950B-GigabitEthernet0/1/7.50] mpls l2vc 1.1.1.144 100 raw
----End
Root Cause
The encapsulation mode of two ends are inconsistent.
