Home > Articles > Network Technology > IP Communications/VoIP > Troubleshooting Any Transport over MPLS Based VPNs

Troubleshooting Any Transport over MPLS Based VPNs

Chapter Description

MPLS Layer 3 VPNs allow a service provider to provision IP connectivity for multiple customers over a shared IP backbone, while maintaining complete logical separation of customer traffic and routing information. Learn more about MPLS Layer 3 VPNs in this sample chapter from Cisco.

show and debug Command Summary

Table 6-2 summarizes show and debug commands used to troubleshoot MPLS in this chapter. Note that where appropriate, the equivalent old-style TDP command structure is shown.

Table 6-2show and debug Command Summary

Command

Parameter

Description

show ip cef

<none>

Displays the CEF FIB

 

summary

Displays a summary of the CEF FIB

 

vrf vrf_name detail

Shows detailed information about entries in the VRF CEF FIB

show cef

interface

Shows interface CEF information

show adjacency

detail

Displays detailed CEF adjacency table information

show atm vc

<none>

Shows all ATM PVCs, SVCs, and LVCs

show mpls (show tag-switching)

interfaces

Displays information about interfaces configured for MPLS

 

interfaces detail

Displays detailed information about interfaces configured for MPLS

 

forwarding-table

Displays the LFIB

 

forwarding-table prefix detail

Displays detailed information about a prefix in the LFIB

 

forwarding-table labels label_value

Shows LFIB entry that contains the specified local label

 

 

continues

 

forwarding-table labels label_value detail

Shows detailed information about LFIB entry that contains the specified local label

show mpls ldp (show tag-switching tdp)

discovery

Shows information about LDP neighbor discovery

 

neighbor

Shows information about LDP sessions

 

bindings

Displays the LIB

 

parameters

Shows configured LDP parameters

show mpls atm-ldp (show tag-switching atm-tdp)

capability

Shows LDP parameters negotiated on LC-ATM interfaces

show ip vrf

interfaces

Displays information about VRF interfaces

 

detail vrf_name

Displays detailed information about VRF interfaces

show ip protocols

vrf vrf_name

Shows routing protocol information for a specified VRF

show ip route

vrf vrf_name

Shows the VRF routing table

show ip rip database

vrf vrf_name

Shows the RIP database for a specified VRF

show ip eigrp vrf vrf_name

interfaces

Shows EIGRP interface information for a specified VRF

 

neighbors

Shows EIGRP neighbor information for a specified VRF

 

topology

Displays the EIGRP topology table for the specified VRF

 

traffic

Shows EIGRP traffic information for the specified VRF

show ip bgp vpnv4 vrf vrf_name

<none>

Shows the (VPN-IPv4 address family) BGP table for the specified VRF

 

labels

Shows labels associated with VPN-IPv4 prefixes for a specified VRF

show ip pim mdt bgp

<none>

Shows information about MP-BGP neighbors advertising participation in MVPNs

debug mpls (debug tag-switching)

atm-ldp api (atm-tdp api)

Shows information about LVCs

 

ldp transport events (tdp transport events)

Shows information concerning LDP neighbor discovery

 

ldp messages (tdp pies sent)

Displays information concerning LDP messages sent to and from the LSR

 

ldp advertisements (tdp advertisements)

Shows information concerning the advertisement of labels and interface addresses

 

ldp bindings (tdp bindings)

Displays information about label bindings and addresses received from peer LDP LSRs


9. Review Questions | Next Section Previous Section