H3C Technologies H3C S7500E Series Switches - Manual (Page 123)

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To do… Use the command... Remarks
Enter system view of the PLR
node
system-view ––
Enter MPLS view mpls ––
Configure the FRR polling timer
mpls te timer fast-reroute
[ second ]
Optional
The FRR polling timer is 300
seconds by default.
Inspecting an MPLS TE Tunnel
On an MPLS TE network, when an MPLS TE tunnel fails, the control plane cannot detect the failure or
cannot do so in time. This brings difficulty to network maintenance. To detect MPLS TE tunnel failures
in time and locate the failed node, the device provides the following mechanisms:
z
MPLS LSP ping
z
MPLS LSP tracert
Using MPLS LSP Ping
MPLS LSP ping can be used to check the validity and availability of an MPLS TE tunnel. At the ingress,
it adds the label for the MPLS TE tunnel to be inspected into an MPLS echo request, which then is
forwarded along the MPLS TE tunnel to the egress. The ingress determines whether the MPLS TE
tunnel is normal according to whether it can receive a reply from the egress.
Use the following command to check the validity and reachability of an MPLS TE tunnel:
To do… Use the command…
Use MPLS LSP ping
to check the validity
and reachability of an
MPLS TE tunnel
ping lsp [ -a source-ip | -c count | -exp exp-value | -h ttl-value | -m wait-time | -r
reply-mode | -s packet-size | -t time-out | -v ] * te interface-type interface-number
Using MPLS LSP Tracert
MPLS LSP tracert can be used to locate errors of an MPLS TE tunnel. It sends MPLS echo requests
to the nodes along the MPLS TE tunnel to be inspected, with the TTL increasing from 1 to a specified
value. Each node along the MPLS TE tunnel will return an MPLS echo reply to the ingress due to TTL
timeout. Thus, the ingress can collect the information of each hop along the MPLS TE tunnel, so as to
locate the failed node. You can also use MPLS LSP tracert to collect important information of each hop
along the MPLS TE tunnel, such as the label allocated.
Use the following command to locate errors of an MPLS TE tunnel: