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FS#1185 — FS#5192 — HG 188.165.12/24

Attached to Project— Network
Incident
Whole Network
CLOSED
100%
Thereafter the network equipments' update in HG servers racks of the network 188.165.12/24 we had interesting logs showing an old problem on some servers happening sometimes on this network.

We're trying to fix it.

Date:  Wednesday, 02 March 2011, 11:57AM
Reason for closing:  Done
Comment by OVH - Tuesday, 01 March 2011, 19:48PM

We found the origin of this problem.


Comment by OVH - Tuesday, 01 March 2011, 19:53PM

We replaced the GLBP by the HSRP and the problem seems fixed.

The problem is that 2 routers managing the network 188.165.12/24 enables the GLBP (this is normal) but with the same MAC and without taking into account the neighbour!

router 1 # sh glbp
State is Active
Active is local
Standby is unknown
Group members:
XXXX.XXXX.XXX1 (XXX.XXX.XXX.XX1) local
There is 1 forwarder (1 active)
Forwarder 1
State is Active
MAC address is 0007.b400.0101 (default)

router 2 # sh glbp
State is Active
Active is local
Standby is unknown
Group members:
XXXX.XXXX.XXX2 (XXX.XXX.XXX.XX2) local
There is 1 forwarder (1 active)
Forwarder 1
State is Active
MAC address is 0007.b400.0101 (default)


Comment by OVH - Tuesday, 01 March 2011, 20:21PM

The reboot of one out of 2 N5 has fixed the problem ... !!!!!!!!!!!!!!!!

GLBP works now on 2 routers.
this means that one out of 2 N5 which manages the double attach prevents the communication with its router.

I don't even know what to say


Comment by OVH - Tuesday, 01 March 2011, 20:55PM

Whatever, bugs are the same!
We reboot and that would work!

State is Active
Active is local
Standby is 188.165.12.252, priority 100 (expires in 8.736 sec)
Group members:
0064.403a.f9c0 (188.165.12.253) local
aca0.160b.bdc0 (188.165.12.252) authenticated
There are 2 forwarders (1 active)
Forwarder 1
State is Active
MAC address is 0007.b400.0a01 (default)
Forwarder 2
State is Listen
MAC address is 0007.b400.0a02 (learnt)


Comment by OVH - Wednesday, 02 March 2011, 11:54AM

There is an incompatibility between the GLBP on the 6500
(SXI5) and the FEX configuration in vPC (5.0.2.N2.1).

We move to HSRP.


Comment by OVH - Wednesday, 02 March 2011, 11:56AM

And in HSRP it works which proves the bug between
the 2 technos: GLBP and VPC

Everything is fixed. Sorry again for the cut off.