Alcatel-Lucent 5620 Troubleshooting Manual page 98

Release 12.0 R4 | August 2014 | 3HE 08864 AAAD TQZZA Edition 01
6 — Troubleshooting network management LAN issues
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1 Log in to the 7750 SR or another 5620 SAM-managed device.
2 Run the traceroute command:
> traceroute SAM_server_IP_address ↵
A list of hops and IP addresses appears.
3 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
packets or packet fragmentation.
4 Repeat for all other hops until a ping fails or until a message indicates that there
is an MTU mismatch. A failed ping indicates that the intermediate device does not
support large SNMP packets or packet fragmentation.
5 Check the configuration of the intermediate device, and configure fragmentation
or enable a larger MTU size.
6-6
7210 SAS, 7450 ESS, 7705 SAR, 7710 SR, 7750 MG, 7750 SR, and 7950 XRS
require an SNMP PDU size of 9216 bytes and fragmentation support in the
network path between the 5620 SAM and the NE.
Ensure that the CPM filters on managed devices are configured to accept
fragmented packets, and that this filter policy is configured on each server in
a redundant 5620 SAM deployment.
Ensure that devices located between the managed devices, such as the
7750 SR, and the 5620 SAM can handle an MTU size of 9216 bytes, can fragment
large SNMP packets, or can forward fragmented L2 or L3 packets.
Verify the MTU packet sizes for all LAN devices.
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, with a large packet.
Ensure that the firewalls between the managed devices and the 5620 SAM
server are configured to allow traceroute and ping packets.
Alcatel-Lucent 5620 Service Aware Manager
Troubleshooting Guide
5620 SAM