RE: Using link congestion to control routing updates
IIRC, and I may be wrong, either IS-IS or CLNS (can't remember which) can look at congestion, and EIGRP can look at load if you tweak the K parameters. -Ejay -----Original Message----- From: David Scott Olverson [mailto:olverson@fas.harvard.edu] Sent: Thursday, December 19, 2002 11:10 AM To: nanog@merit.edu Subject: Using link congestion to control routing updates Hello all, I was wondering if anyone was aware of a way to use the congestion of a network link to control the routing update. For example if I have a very small link that gets congested, I may want the router to withhold a routing update until link congestion falls below a certain threshold like 60% of bandwidth. Is anyone aware of anything like this available today or a technique that might accomplish something similar? You can contact me off list if this topic isn't germane. Thanks for your help, Dave Olverson
Opposite problem -- he wants to delay routing updates if the link is full. EIGRP by default won't use more than 25/50% (I forget) of link bw, for instance, but I'm not aware of any intentional features in other IGPs to do this. If routing updates constitute enough traffic to disrupt your links, you need to investigate why you have so many updates instead of putting a band-aid on the problem. S Ejay Hire wrote:
IIRC, and I may be wrong, either IS-IS or CLNS (can't remember which) can look at congestion, and EIGRP can look at load if you tweak the K parameters.
-----Original Message----- From: David Scott Olverson [mailto:olverson@fas.harvard.edu] Sent: Thursday, December 19, 2002 11:10 AM To: nanog@merit.edu Subject: Using link congestion to control routing updates
I was wondering if anyone was aware of a way to use the congestion of a network link to control the routing update. For example if I have a very small link that gets congested, I may want the router to withhold a routing update until link congestion falls below a certain threshold like 60% of bandwidth. Is anyone aware of anything like this available today or a technique that might accomplish something similar? You can contact me off list if this topic isn't germane.
Stephen Sprunk wrote:
Opposite problem -- he wants to delay routing updates if the link is full. EIGRP by default won't use more than 25/50% (I forget) of link bw, for instance, but I'm not aware of any intentional features in other IGPs to do this.
Both OSPF and ISIS in Cisco's have pacing, ie they will not flood LSAs/LSPs over a certain configurable limit. Not sure about other platforms.. -A
IIRC, and I may be wrong, either IS-IS or CLNS (can't remember which) can look at congestion, and EIGRP can look at load if you tweak the K parameters.
Silly redistribution of IGP into BGP leads to flapping. Flapping leads to dampening. Dampening leads to suffering. Alex
On Thu, 19 Dec 2002 alex@yuriev.com wrote:
IIRC, and I may be wrong, either IS-IS or CLNS (can't remember which) can look at congestion, and EIGRP can look at load if you tweak the K parameters.
Silly redistribution of IGP into BGP leads to flapping. Flapping leads to dampening. Dampening leads to suffering.
Suffering leads to pain Pain leads to the dark side?
Be mindful of your routes Master Luke! On Thu, 19 Dec 2002, Stephen J. Wilcox wrote:
On Thu, 19 Dec 2002 alex@yuriev.com wrote:
IIRC, and I may be wrong, either IS-IS or CLNS (can't remember which) can look at congestion, and EIGRP can look at load if you tweak the K parameters.
Silly redistribution of IGP into BGP leads to flapping. Flapping leads to dampening. Dampening leads to suffering.
Suffering leads to pain Pain leads to the dark side?
participants (6)
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alex＠yuriev.com -
Anders Lowinger -
Ejay Hire -
Scott Granados -
Stephen J. Wilcox -
Stephen Sprunk