display mpls l2vpn track route

Function

The display mpls l2vpn track route command displays information about the PWs that track VPNv4 route status.

Format

display mpls l2vpn track route [ ipv4-address { mask | mask-length } vpn-instance vpn-instance-name ]

Parameters

Parameter	Description	Value
ipv4-address	Specifies the destination IP address of a VPNv4 route.	The value is in dotted decimal notation.
mask	Specifies a mask in dotted decimal notation.	The value is in dotted decimal notation.
mask-length	Specifies the mask length.	The value is an integer ranging from 0 to 32.
vpn-instance vpn-instance-name	Specifies the VPN instance name.	The value must be an existing VPN instance name.

Views

All views

Default Level

1: Monitoring level

Usage Guidelines

In an L2VPN access to L3VPN scenario, if all L3VPN-side links of an NPE become unavailable, a black-hole route comes into existence. The user-side UPE cannot detect the link failures and still sends traffic to the NPE. As a result, traffic loss occurs. To prevent traffic loss, run the mpls l2vpn track route command to configure the PW to track VPNv4 route status. Then, after the NPE detects that all its L3VPN-side links become unavailable, the NPE instructs the UPE to switch traffic to the secondary PW.

To check information about the PWs that track VPNv4 route status, run the display mpls l2vpn track route command.

Example

# Display information about all PWs that track VPNv4 route status.

<HUAWEI> display mpls l2vpn track route
Total route number:1      reachable:0      unreachable:1     
-------------------------------------------------------------

VPN instance name : vpna
Route             : 10.1.1.1/32
Route status      : reachable                                          
PW number         : 1
VC ID      VC Type                Peer IP            VC State   
-------------------------------------------------------------
101        VLAN                   10.1.1.2           up

**Table 1** Description of the **display mpls l2vpn track route** command output
Item	Description
Total route number	Total number of VPNv4 routes tracked by a PW.
reachable	Number of reachable VPNv4 routes.
unreachable	Number of unreachable VPNv4 routes.
VPN instance name	VPN instance name.
Route	Destination IP address of a VPNv4 route.
Route status	VPNv4 route status: reachable unreachable
VC ID	ID of a VC, which uniquely identifies the VC.
VC Type	Encapsulation type of the VC: VLAN Ethernet
Peer IP	Peer IP address.
VC State	VC status: up: The VC is established. Down: The VC is not established.