topic RE: Fall routing on X460 in ExtremeSwitching (EXOS/Switch Engine)

Fall routing on X460

Yurij — Fri, 13 Jun 2014 02:12:00 GMT

today started having problems with routing on the X460-48x
is lost "IP Forwarding Enabled" on interfaces, in consequence of which falls OSPF ...

after the command "enable ipforwarding" - all restored
firmware 15.3.3.5 v1533b5-patch1-9

can anyone know why and what to do?

RE: Fall routing on X460

PARTHIBAN_CHINN — Fri, 13 Jun 2014 10:07:00 GMT

This is something new.
Is it ok to contact TAC ? with the below information
1.configs
2.Network topology
3.when was the software upgraded
4.when did this issue occur? [logs ,list of activities carried out in network]

RE: Fall routing on X460

Sumit_Tokle — Fri, 13 Jun 2014 13:42:00 GMT

Open case with TAC.

RE: Fall routing on X460

Sumit_Tokle — Sat, 14 Jun 2014 08:46:00 GMT

IP forwarding would not disable by default. There could be possibility that trigger could come from SNMP.

Is it possible for you to disable the SNMP access and monitor the switches?

RE: Fall routing on X460

PARTHIBAN_CHINN — Sat, 14 Jun 2014 08:56:00 GMT

You can use snmp acces profile and allow only valuable request.

RE: Fall routing on X460

Dave_E_Martin — Sat, 14 Jun 2014 09:28:00 GMT

We had this issue also. We removed the default SNMP communities from all switches (not knowing if that was the actual problem, but we discovered that some switches did not have their default communities removed while investigating).

Unfortunately, this does not show up in the configuration one way or the other. You can "show management", but I'm not sure at the moment to see what the actual community strings are that are defined.

configure snmp delete community readonly all configure snmp delete community readwrite all configure snmp add community readonly yourcommunitystringWe have not had the problem so far, since doing this.

We are a bit annoyed that the switches ship with these enabled, and they DON"T show up in the configuration.

RE: Fall routing on X460

Sumit_Tokle — Sat, 14 Jun 2014 09:32:00 GMT

To see what default configuration present on switch regarding the SNMP, execute the command: "show configuration snmp detail"

To see all the SNMP community on switch: "show snmpv3 community"

RE: Fall routing on X460

PARTHIBAN_CHINN — Sat, 14 Jun 2014 10:21:00 GMT

Dave this issue looks new. Recent study has revealed issue occurs with latest patch version in flavours of 15.x versions.might be code behaviour with snmp has. Changed which needs to be corrected.

RE: Fall routing on X460

Yurij — Sat, 14 Jun 2014 14:46:00 GMT

Thank you very much, snmp really was thrown into default and removed access list
after the ban on access to SNMP - the problem stopped

RE: Fall routing on X460

Sumit_Tokle — Sat, 14 Jun 2014 15:07:00 GMT

Nice to hear that the issue got resolved.

RE: Fall routing on X460

Dave_E_Martin — Sat, 14 Jun 2014 18:44:00 GMT

I forgot to mention, enable ipforwarding on loopback vlan didn't seem to work, (it worked on the other vlans) and in any case, we didn't trust the configuration and rebooted without saving changes. Everything was fine after reboot. I did a showtech before rebooting, but I haven't gone through it yet to see what else may have been altered.

RE: Fall routing on X460

PARTHIBAN_CHINN — Sat, 14 Jun 2014 19:44:00 GMT

It changes the ttl value to the switch internally. Reboot will fix it.bgp neighbour may not come up due to change in ttl value of the switch.

RE: Fall routing on X460

Andre_Brits_Kan — Mon, 15 Sep 2014 17:20:00 GMT

We had the same problem today with Code version 15.4.2.8
We will try and disable the default SNMP community string
I will provide more feedback once we have tested this.

Thank you

RE: Fall routing on X460

PARTHIBAN_CHINN — Mon, 15 Sep 2014 21:15:00 GMT

There was an Official document released in extreme website For snmp best practices . 3 months back this issue was hot but now it's a known issue. I would recommend to follow snmp best practises as per extreme to avoid this issue reoccurring .

RE: Fall routing on X460

Sumit_Tokle — Mon, 15 Sep 2014 21:58:00 GMT

Below is the link for the document,

https://www.extremenetworks.com/wp-content/uploads/2014/06/BP001-SNMP-Best-Practice-Recomendations-rev-01.pdf