Chapter 10: Troubleshooting unicast
routing
Use the information in this section to assist you in troubleshooting issues with unicast routing.
Begin troubleshooting routing issues by verifying that the IP interfaces in the system are "up". Use the
following
commands to check the status of IP interfaces: show ip interfaces format brief (IPv4)
show ipv6 interfaces format brief (IPv6)
Use the ping feature to perform reachability tests for a specific destination. A useful ping option is the
sweep that tests for varied packet sizes. For example: ping 10.0.0.1 sweepmin 36 sweepmax
1500
The ping "sweep" option helps to identify issues with particular packet sizes in the network. Routing
protocols send varied sizes of packets. Drops of specific sizes can affect the routing operations.
When routing protocol adjacencies are "stuck", and certain packets are not flowing properly over specific
interfaces, enter the shutdown command followed by the no shutdown command on that interface to
try and clear the issue.
The route tracing feature is also useful in identifying points of failure in the network. You use route tracing
for network testing and management. A route tracing command records the route (the specific gateway
address at each hop) through the Internet between your source device and a specified destination device.
Route tracing also calculates and displays the duration of time from each hop to the next.
The Avaya Secure Router 2330/4134 provides tools for tracing an IPv4 route and an IPv6 route. For
information about multicast route tracing, see
Troubleshooting multicast routing on page
153.
Procedure steps
1. To trace an IPv4 route, enter:
trace <WORD> [sipaddress <ipaddr>] [proto {icmp|udp}] [timeout
<value>] [probecnt <value>] [minttl <value>] [maxttl <value>] [portno
<port>] [symdisp {on|off}]
2. To trace an IPv6 route, enter:
trace6 <WORD> [sipaddress <ipaddr>] [proto {icmp|udp}] [timeout
<value>] [probecnt <value>] [minttl <value>] [maxttl <value>] [portno
<port>] [symdisp {on|off}]
3. To end a route trace, enter the following keyboard escape sequence:
CTRL + C
Troubleshooting August 2013 125
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