Information Technology Reference
In-Depth Information
Example 10-3
Output of
show mpls ldp discovery
on R4 (Continued)
Discovery Sources:
Interfaces:
Ethernet1/0 (ldp): xmit/recv
LDP Id: 192.168.100.5:0
Ethernet2/0 (ldp): xmit/recv
LDP Id: 192.168.100.2:0
The LDP router ID by default is the highest loopback IP address or the highest IP address
of an up interface. This address must be routable. You can fix the router ID by configuring
mpls ldp router-id
interface
. The change takes effect when the interface is up and when
either the interface for the current ID is down or LDP is reset. To force the ID change
immediately, append the command with the keyword
force
, which resets the LDP sessions.
NOTE
Example 10-4 shows the two LDP sessions on R4. Note that an LDP session is established
over TCP port 646. All available peer interface addresses are also listed per session.
Example 10-4
Output of
show mpls ldp neighbor
on R4
R4#show mpls ldp neighbor
Peer LDP Ident: 192.168.100.5:0; Local LDP Ident 192.168.100.4:0
TCP connection: 192.168.100.5.11013 - 192.168.100.4.646
State: Oper; Msgs sent/rcvd: 22627/22644; Downstream
Up time: 1w6d
LDP discovery sources:
Ethernet1/0, Src IP addr: 192.168.45.5
Addresses bound to peer LDP Ident:
192.168.100.5 192.168.56.5 192.168.35.5 192.168.45.5
Peer LDP Ident: 192.168.100.2:0; Local LDP Ident 192.168.100.4:0
TCP connection: 192.168.100.2.646 - 192.168.100.4.11745
State: Oper; Msgs sent/rcvd: 20953/20956; Downstream
Up time: 1w5d
LDP discovery sources:
Ethernet2/0, Src IP addr: 192.168.24.2
Addresses bound to peer LDP Ident:
192.168.100.2 192.168.12.2 192.168.24.2 192.168.23.2
The default label exchange protocol in most Cisco IOS software releases is TDP, but
you can change it to LDP either globally or per interface using the command
mpls label
protocol ldp
. Neighbor relationships are formed between a pair of routers, not between
individual interfaces.
NOTE
