VPN traffic control

[Leon]

Our company has a full tunnel VPN setup with some vendors and they have been doing big transfers which saturate one of our pipes. We have 2 ISPs connects to 2 cisco ASRs. Currently all the traffic are flowing through pipe A only. Is there anyway that I can reroute the traffic to pipe B ??

Thanks for any adivse.

[rizwanr74 · Accepted solution]

If your both ASR's outside interface are connected an intermediate switch, then you can use route-map on the switch to reset next-hop address to pipe B's router outside interface.  If that is not your layout then you can use QoS to cap the bandwidth utilization on either on of your router or on the ASA itself.

thanks

[Leon]

Thanks for your reply! I think capping is probably the only way to go. T

[Joseph W. Doherty]

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Posting

There are many way to control and select outbound paths, so you should be able to fairly easily redirect the outbound VPN traffic to pipe B.  (Often I suggest egress QoS to manage which flows get what bandwidth when there's congestion.)

Inbound control, especially from the Internet, is much more difficult to control.  As the other poster noted, you can cap inbound bandwidth utilization of the VPN traffic, but doing this downstream of the congestion bottleneck (your pipe A) doesn't always work as well as we would like.  If the traffic is not rate-adaptive, it will use whatever bandwidth it can on your pipe.  If it is rate-adaptive, it should slow as you drop some of its packets, but it may exceed the policer rate (and use your pipe's bandwidth) before it gets to your policer.