Mpls Oam Using Nil Fec - Cisco NCS 5500 Series Configuration Manual

MPLS OAM Using Nil FEC

Codes: '!' - success, 'Q' - request not sent, '.' - timeout,
'L' - labeled output interface, 'B' - unlabeled output interface,
'D' - DS Map mismatch, 'F' - no FEC mapping, 'f' - FEC mismatch,
'M' - malformed request, 'm' - unsupported tlvs, 'N' - no rx label,
'P' - no rx intf label prot, 'p' - premature termination of LSP,
'R' - transit router, 'I' - unknown upstream index,
'X' - unknown return code, 'x' - return code 0
Type escape sequence to abort.
0 11.1.1.57 MRU 1500 [Labels: implicit-null Exp: 0]
! 1 11.1.1.58 7 ms23:19
MPLS OAM Using Nil FEC
The Nil-FEC LSP ping and traceroute operations are extensions of regular MPLS ping and traceroute. MPLS
ping and traceroute requires at least one forwarding equivalence class (FEC) in the target FEC stack. In
Nil-FEC ping and traceroute operations, an explicit FEC is not associated with the label. Nil-FEC LSP ping
and traceroute support MPLS static LSPs and also act as an additional diagnostic tool for all other LSP types.
Nil-FEC LSP ping and traceroute allow network operators to provide the ability to freely test any label stack
by allowing them to specify the following:
• label stack
• outgoing interface
• nexthop address
The following table shows the syntax for the ping and traceroute commands.
Table 4: LSP Ping and Traceroute Nil FEC Commands
Command Syntax
ping mpls nil-fec labels {label[,label]} [output {interface tx-interface} [nexthop nexthop-ip-addr]]
traceroute mpls nil-fec labels {label[,label]} [output {interface tx-interface} [nexthop nexthop-ip-addr]]
Examples: LSP Ping Nil FEC and LSP Traceroute Nil FEC
The examples in this section use the following topology:
Node loopback IP address: 172.18.1.3
Node label:
Nodes:
Interface:
Interface IP address:
RP/0/RP0/CPU0:router-arizona# show mpls forwarding
Tue May
Local
Label
------ ----------- ------------------ ------------ --------------- ------------
MPLS Configuration Guide for Cisco NCS 5500 Series Routers, IOS XR Release 6.2.x
62
16003
Arizona ---- Utah ------- Wyoming ---- Texas
GigabitEthernet0/2/0/1
10.1.1.3
2 13:44:31.999 EDT
Outgoing Prefix
Label or ID
172.18.1.4 172.18.1.5
16004 16005
GigabitEthernet0/2/0/1
10.1.1.4
Outgoing Next Hop
Interface
Implementing MPLS OAM
172.18.1.7
16007
Bytes
Switched