Zte ZXR10 8900 Series Command Reference Manual page 39

the interface has an IP address and it is in the UP state, the
address of the interface will be used as the router identifier.
2. Secondly, if there are loopback interfaces configured with IP
addresses, the maximum IP address of the loopback interface
will serve as the router identifier.
3. Lastly, among the IP addresses of interfaces configured with IP
addresses and in the UP state, the maximum one is selected
as the router identifier.
Instructions By default, the automatically elected router identifier may be un-
available sometimes, for example, the routing protocol does not
advertise the IP address elected as the router identifier to neigh-
bors. In addition, the router configuration may cause the LPD
router identifier is uncertain, and this invalidates the neighbor's
control policy.
The mpls ldp router-id command specifies the IP address of an
interface as the router identifier. Note that the interface whose IP
address serves as the router identifier must be in the UP state.
If the optional parameter force is not specified, the router iden-
tifier specified by the mpls ldp router-id command will not take
effect until the next router identifier election, and the router iden-
tifier takes place in the following cases:
1. LDP restarts.
2. The interface whose IP address serves as the current router ID
is shut down.
3. The interface whose IP address is specified as the current
router ID is not configured with any address.
If the optional parameter force is specified, the effect of the m
pls ldp router-id command depends on the current state of the
specified interface.
1. If the specified interface is in the UP state and its address is not
the current router identifier, the router will change the router
identifier to the specified value, interrupt all the current ses-
sions, release labels learned from the sessions, and terminate
the MPLS forwarding related with the bounding of these labels.
2. If the specified interface is in the DOWN state, the router will
change the router identifier to the specified value once the in-
terface is in the UP state, interrupt all the current sessions,
release labels learned from the sessions, and terminate the
MPLS forwarding related with the bounding of these labels.
Example
This example describes how to specify the IP address of the inter-
face fei_1/1 as the router identifier.
ZXR10(config)#mpls ldp router-id fei_1/1
Confidential and Proprietary Information of ZTE CORPORATION
Chapter 2 MPLS LDP Configuration
29