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FS#3363 — FS#7313 - GTS routing

Attached to Project— Network
Incident
Whole Network
CLOSED
100%
Following the migration to PLIX last night, we are experiencing a routing issue with GTS AS 8246. We have temporarily made some modifications in order to re-route teh traffic via Frankfurt. We are investigating.
Date:  Monday, 01 October 2012, 16:18PM
Reason for closing:  Done
Comment by OVH - Wednesday, 12 September 2012, 17:06PM

We have identified a misconfiguration on the new var-5-6k router that was in conflict with var-1<>fra-1/5 links, which are currently in production. The routing with GTS has been impacted due to the fact that we are peering with this AS on DEC-IX in Frankfurt and PLIX in Warsaw.


Comment by OVH - Wednesday, 12 September 2012, 17:08PM

The problem still occurs. It's not due to a misconfiguration, only GTS > OVH traffic via PLIX seems concerned. We have contacted the GTS noc in order to work with them to fix the issue.


Comment by OVH - Thursday, 13 September 2012, 12:03PM

We have stopped our announcements to GTS on PLIX since last night in order to maintain the connectivity between our networks. We are in contact with the GTS noc. There seems to have a problem between our peering routers (ARP) in Warsaw. We are first going to establish a direct BGP session between our networks in order to better monitor the interconnection.


Comment by OVH - Friday, 14 September 2012, 15:46PM

We have established a BGP session but the session is not stable due to ARP problems between our equipment. The GTS router doesn't manage to fix the arp to our router. We keep working with the GTS and PLIX noc on this issue.


Comment by OVH - Thursday, 20 September 2012, 22:14PM

We keep working on the definitive resolution of the problem. The GTS > OVH flow are currently going through Frankfurt because we interrupted our announcements to GTPS on PLIX. The trafic OVH > GTS is going normally by the PLIX to Warsaw.


Comment by OVH - Monday, 01 October 2012, 16:18PM

We have reduced the ARP timeout on our router and it seems to allow the ARP entry to stay updated on the router from GTS. BGP peering session between GTS and OVH is stable since 3 days now. We restore the announcement of our prefixes. The traffic in the sense GTS > OVH is now flowing again through Warsaw.