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Hello,
Looking at one of our our BGP routers (AS36149) I see you through AS25625. Have you tried mirroring the traffic to see what it is and where it's going? Perhaps you could remove proprietary parts of your config and let us see it?
scott
--- Alo.Anesi@bluesky.as wrote:
I seem to be having some problems with my multihoming arrangement. Our current setup is to advertise our /20 on both of our upstream providers: AS25625 is the primary and AS30362 is the secondary.
I have a 10x as-path prepend for AS30362 since we only have a single T1 with that upstream. There is no as-path prepend on our primary.
What I'm trying to do is have all traffic flow through our primary and only go through the secondary when the primary link fails. What actually happens is that our secondary link becomes saturated and our primary link only runs at about 50% capacity even with the maximum as-path prepend.
I've checked several looking glass routers and our primary link seems to be the best path, but I can't account for such a large amount of traffic on our secondary.
Any suggestions?
P.S. We are AS23657
The config is pretty straightforward:
Router peering with Primary AS25625:
router bgp 23657 no synchronization bgp log-neighbor-changes network 202.70.112.0 mask 255.255.240.0 neighbor 202.70.114.101 remote-as 25625 neighbor 202.70.114.101 description Peering with Upstream IP Access neighbor 202.70.114.101 soft-reconfiguration inbound neighbor 202.70.114.101 prefix-list DEFAULT-ONLY in neighbor 202.70.114.101 prefix-list BSKY-AGGREGATE out neighbor 202.70.114.101 route-map ALLOW-DEFAULT-IN in neighbor 202.70.114.101 route-map BSKY-OUT out
ip prefix-list BSKY-AGGREGATE seq 5 permit 202.70.112.0/20 ! ip prefix-list DEFAULT seq 15 permit 0.0.0.0/0
route-map ALLOW-DEFAULT-IN permit 10 match ip address prefix-list DEFAULT-ONLY set local-preference 220
route-map BSKY-OUT permit 10 match ip address prefix-list BSKY-AGGREGATE
Router peering with Secondary AS30362:
router bgp 23657 no synchronization bgp log-neighbor-changes network 202.70.112.0 mask 255.255.240.0 neighbor HPT peer-group neighbor HPT remote-as 30362 neighbor HPT next-hop-self neighbor HPT remove-private-AS neighbor HPT version 4 neighbor HPT soft-reconfiguration inbound neighbor HPT route-map HPT_NET_IN in neighbor HPT route-map HPT_NET_OUT out neighbor x.x.x.x peer-group HPT neighbor x.x.x.x ebgp-multihop 3 neighbor x.x.x.x peer-group HPT neighbor x.x.x.x ebgp-multihop 3
route-map HPT_NET_OUT permit 10 match ip address prefix-list US_MAINLAND_TRANSIT_OUT set as-path prepend 23657 23657 23657 23657 23657 23657 23657 23657 23657 23657
ip prefix-list US_MAINLAND_TRANSIT_OUT seq 5 permit 202.70.112.0/20
That's it in a nutshell. As for mirroring, can you span/mirror a serial port to an Ethernet port on a 7206VXR?
-----Original Message----- From: pacnog-bounces@pacnog.org [mailto:pacnog-bounces@pacnog.org] On Behalf Of Scott Weeks Sent: Wednesday, February 07, 2007 12:29 PM To: pacnog@pacnog.org Subject: Re: [pacnog] Multihoming Problem
Hello,
Looking at one of our our BGP routers (AS36149) I see you through AS25625. Have you tried mirroring the traffic to see what it is and where it's going? Perhaps you could remove proprietary parts of your config and let us see it?
scott
--- Alo.Anesi@bluesky.as wrote:
I seem to be having some problems with my multihoming arrangement. Our current setup is to advertise our /20 on both of our upstream providers: AS25625 is the primary and AS30362 is the secondary.
I have a 10x as-path prepend for AS30362 since we only have a single T1 with that upstream. There is no as-path prepend on our primary.
What I'm trying to do is have all traffic flow through our primary and only go through the secondary when the primary link fails. What actually happens is that our secondary link becomes saturated and our primary link only runs at about 50% capacity even with the maximum as-path prepend.
I've checked several looking glass routers and our primary link seems to be the best path, but I can't account for such a large amount of traffic on our secondary.
Any suggestions?
P.S. We are AS23657
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