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Aastra VOIP phone and ELRP

Aastra VOIP phone and ELRP

Mykhaylo_Skrypk
New Contributor III
Hi All,

We are currently struggling with an issue which appears to exist between our Extreme edge switches and certain models of VoIP phones.

Basically, despite having ELRP configured, if a user creates a loop by plugging both the PC and LAN ports on the back of a phone into the same switch the switch does not detect it.

We have carried out packet captures. With a laptop plugged directly into the switch, we see the ELRP packets every 2 seconds. If we put one of these phones in between (with the laptop plugged into the phones PC port) the ELRP packets do not arrive.

This suggests that the phones are stripping/filtering the packets in some way.

Any suggestions are welcome.

Thank you,
Mykhaylo
5 REPLIES 5

Mykhaylo_Skrypk
New Contributor III
Hi Matthew,

Just to confirm that this configuration works fine with Aastra 6731i model.

Only Aastra 4425 or 4422 are affected.

enable elrp-client
configure elrp-client periodic B37 ports 1:1-46, 2:1-3, 2:5-40, 2:42-48, 3:1-46, 4:1-48, 5:1-5, 5:7-48 interval 2 log-and-trap disable-port duration 30
configure elrp-client periodic B37_VOIP ports 1:1-46, 2:1-3, 2:5-40, 2:42-48, 3:1-46, 4:1-48, 5:1-5, 5:7-48 interval 2 log-and-trap disable-port duration 30

Cheers,
Mykhaylo

Kevin_Kim
Extreme Employee
Storm control (flood rate-limit) would help. ('disable port' option is available in 16.1 or later)

# configure ports rate-limit flood broadcast out-actions disable-port
Execute the command
log Generate log event if traffic exceeds configured rate
trap Generate SNMP trap if traffic exceeds configured rate

Eric_Burke
New Contributor III
Was going to suggest the same as Matthew. ELRP is associated with one or more VLAN's.

Matthew_Helm1
Extreme Employee
Do you use a separate VLAN for voice and data? if so, do you have the elrp client configured for both VLANs on the port?
GTM-P2G8KFN