October 2002
Intermediate to advanced
560 pages
12h 13m
English
Content preview from Cisco® Field Manual: Catalyst® Switch ConfigurationBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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12-6. Packet Tracing
The ping (Packet Internet Groper) command can be used to test end-to-end connectivity from a switch to a remote host. The IP ping uses ICMP type 8 requests and ICMP type 0 replies.
The traceroute or Layer 3 traceroute command can be used to discover the routers along the path that packets are taking to a destination. An IP traceroute uses UDP probe packets on port 33434.
The l2trace or Layer 2 traceroute command can be used to discover the physical path that a packet will take through a switched network.
l2trace looks up the destination in the forwarding table, and then contacts the next neighboring switch via CDP. Each switch hop is queried in a similar fashion.
l2trace is only supported on Catalyst 4000, 5000, and 6000 (COS ...
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