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The BGP IPv6 Router ID Is Not Automatically Generated on the CE6800

Publication Date:  2019-04-12 Views:  166 Downloads:  0

Issue Description

Device model: CE6800 running V200R002C50

The issue description is as follows:

[CE6800]display bgp ipv6 peer
BGP local router ID : //The IPv4 address of the device is not selected as the router ID.
Local AS number  : 2.4305
Total number of peers : 1 
Peers in established state : 0

  Peer     V     AS  MsgRcvd  MsgSent  OutQ  Up/Down      State  PrefRcv
  2604:980:2001:108::1 4     21859    0     0    0 00:00:03        Idle        0

The key configurations are as follows:

interface MEth0/0/0
 description IBMGT
 ip binding vpn-instance IBMGT
 ip address

bgp 135377
 peer 2604:980:2001:108::1 as-number 21859
 ipv4-family unicast
 ipv6-family unicast
  peer 2604:980:2001:108::1 enable

Handling Process

1.         Run the display bgp ipv6 peer command to check whether the router ID is generated.

2.         Run the display ip interface brief command to check whether an IPv4 address exists.

3.         Run the display cur interface xxx command to check whether a VPN instance is bound to the interface with the corresponding IPv4 address.

Root Cause

During a BGP router ID selection, a CE switch selects the smallest IPv4 address as the router ID. Although an IP address has been configured for the MEth interface, the switch does not select the IP address of the interface as the router ID because the interface has been associated with a VPN instance.


1.         Manually configure the BGP router ID.

2.         Do not associate a VPN instance with a loopback interface.