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9 — Troubleshooting 5620 SAM server issues
Procedure 9-2 Problem: The 5620 SAM server on a Solaris platform
cannot be reached or does not respond
When the links and ping commands indicate that IP communications are active, but there
are still IP reachability issues, the problem could be poor LAN performance.
To test whether IP packets are arriving at the PC or workstation, whether packets are
missing, or whether packets are slowed because of round trip delays, use the ping -s
command. The ping -s command issues a number of sequentially ordered packets. If
these packets are returned out of sequence, it indicates that there are LAN problems.
1
9-4
When an intermediate network device, such as a router, receives the management
traffic to and from the 5620 SAM and the managed network, it must be able to
process packets of up to 9216 bytes. If this exceeds the MTU for the intermediate
device, or if the device cannot perform packet fragmentation, then large packets
may be dropped and resynchronization may fail. Consider the following:
•
Ensure devices located between the managed devices, such as the 7750 SR,
and 5620 SAM can handle an MTU size of 9216 bytes or can fragment large
SNMP packets.
•
Verify that large packets can travel from the managed devices to the 5620 SAM
by using CLI to ping the IP address of the 5620 SAM server, using a large
packet.
•
Ensure firewalls between the 7450 ESS and 7750 SR and the 5620 SAM sever
are configured to allow traceroute and ping packets.
i
Log on to the 7750 SR or other 5620 SAM-managed device.
ii
Run the traceroute command:
> traceroute SAM_server_IP_address ↵
A list of hops and IP addresses appears.
iii
Ping the first hop in the route from the managed device to the 5620 SAM
server:
> ping intermediate_device_IP_address size 9216 ↵
A successful response indicates that the intermediate device supports large
SNMP packet size or packet fragmentation.
iv
Repeat for all other hops until a ping fails, or until a message indicates that
there is an MTU mismatch. When a ping fails, it indicates that the intermediate
device does not support large SNMP packets or packet fragmentation.
v
Check the configuration of the intermediate device, and configure
fragmentation or enabled a larger MTU size.
Perform a ping -s to test reachability, as described in Procedure 6-3.
Alcatel 5620 Service Aware Manager, Release 2.1 R2
May 2005
95-5887-01-00-B
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Table of Contents
Troubleshooting
