CCNP TSHOOT 6.0 - The Cisco Learning Network

CCNPv6 TSHOOT
Section 2 – Troubleshooting Reference Information
General Troubleshooting Process
As a general guideline, you can use the following general troubleshooting process described in the course:
1. Define the problem (symptoms).
2. Gather information.
3. Analyze the information.
4. Propose a hypothesis (possible cause).
5. Test the hypothesis.
6. Eliminate or accept the hypothesis.
7. Solve the problem.
8. Document the problem.
Command Summary
The table lists useful commands for this lab. Sample output is shown on the following pages.
Command Key Information Displayed
show spanning-tree vlan vlan#
show vlan brief
show vlan id vlan#
show ip interface vlan vlan#
show ip route ip-addr
show ip cef ip-addr detail
show ip cef exact-route src-ipaddr
dest-ip-addr
show adjacency int-type/# detail
show standby vlan vlan# brief
Displays all essential parameters that affect the topology,
such as the root port, designated ports, port state, and port
type, as well as the spanning-tree mode being
implemented.
Displays a quick overview of all existing VLANs and the
ports within them. Trunk ports are not listed.
Displays whether the VLAN exists and which ports are
assigned to it. Includes the trunk ports on which the VLAN
is allowed.
Displays the SVI status, IP address, statistics, and IP Cisco
Express Forwarding (CEF) information.
Displays the routing table information for a particular
destination address.
Displays the next hop and interface used for a particular
destination address from the CEF table.
Displays the next hop and interface used for a particular
destination address from the CEF table.
Displays information contained in the adjacency table for a
next-hop IP address or interface.
Verify active and standby roles and IP addresses for a
particular VLAN for HSRP routers.
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