Specifications

show mpls forwarding-table
MP-598
Cisco IOS Multiprotocol Label Switching Command Reference
January 2010
Explicit-Null Label Example
The following example shows output, including the explicit-null label = 0 (commented in bold), from
the show mpls forwarding-table command on a CSC-PE router:
Router# show mpls forwarding-table
Local Outgoing Prefix Bytes label Outgoing Next Hop
label label or VC or Tunnel Id switched interface
17 Pop label 10.10.0.0/32 0 Et2/0 10.10.0.1
18 Pop label 10.10.10.0/24 0 Et2/0 10.10.0.1
19 Aggregate 10.10.20.0/24[V] 0
20 Pop label 10.10.200.1/32[V] 0 Et2/1 10.10.10.1
21 Aggregate 10.10.1.1/32[V] 0
22 0 192.168.101.101/32[V] \
0 Et2/1 192.168.101.101
23 0 192.168.101.100/32[V] \
0 Et2/1 192.168.101.100
25 0 192.168.102.125/32[V] 0 Et2/1 192.168.102.125 !outlabel
value 0
Table 92 describes the significant fields in the sample output.
Table 92 show mpls forwarding-table Field Descriptions
Field Description
Local label Label assigned by this router.
Outgoing label or VC Label assigned by the next hop or VPI/VCI used to get to next hop. The
entries this column are the following:
• [T]—Means forwarding through an LSP tunnel.
• No label—Means that there is no label for the destination from the
next hop or that label switching is not enabled on the outgoing inter-
face.
• Pop label—Means that the next hop advertised an implicit NULL
label for the destination and that this router popped the top label.
• Aggregate—Means there are several prefixes for one local label. This
entry is used when IPv6 is configured on edge routers to transport
IPv6 traffic over an IPv4 MPLS network.
• 0—Means the explicit null label value = 0.
Prefix or Tunnel Id Address or tunnel to which packets with this label are going.
Note If IPv6 is configured on edge routers to transport IPv6 traffic over
an IPv4 MPLS network, IPv6 is displayed here.
[V]—means that the corresponding prefix is in a VRF.
Bytes label switched Number of bytes switched with this incoming label. This includes the
outgoing label and Layer 2 header.
Outgoing interface Interface through which packets with this label are sent.
Next Hop IP address of the neighbor that assigned the outgoing label.