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Figure 6 Ping TRILL packet forwarding
Tracert TRILL
Tracert TRILL enables retrieval of the nicknames of RBs in the path to a destination RB. In the event
of network failure, use tracert TRILL to test network connectivity and identify failed nodes.
Tracert TRILL operates as shown in
.
1.
RB 1 sends RB 3 an OAM echo request with a hop count value of 0.
2.
The first hop RB 2 responds by sending a hop count error notification to the source RB because
the hop count of the request is 0. The notification uses the nickname of RB 2 as the ingress RB.
In this way, RB 1 can get the nickname of the first hop RB.
3.
RB 1 sends RB 3 an OAM echo request with a hop count value of 1.
4.
RB 2 forwards the request to RB 3 according to the TRILL unicast routing table and decrements
the hop count value by 1.
5.
The second hop RB 3 responds to the source RB with a hop count error notification. The
notification uses the nickname of RB 3 as the ingress RB.
6.
RB 2 forwards the hop count error notification to RB 1. RB 1 gets the nickname of the second
hop RB 3.
