Re: My virtual-link question
Don Goodspeed <Don.Goodspeed@ALCATEL.COM> Sat, 31 July 2004 01:25 UTC
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Date: Fri, 30 Jul 2004 18:25:23 -0700
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From: Don Goodspeed <Don.Goodspeed@ALCATEL.COM>
Subject: Re: My virtual-link question
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Mitchell, Why would a router advertising a virtual-link as one of it's possibly many links MaxAge it's entire router LSA? And in the example that I gave, the router with the virtual- link was not the one in overload. In fact, I made a note at the end of my original description that one could have a virtual-link path where the total path cost exceeded 65535 and my question applied to that scenario as well. Should the end-points of the virtual-link tear down the virtual-link in this case, or advertise the virtual-link with the largest advertisable cost in a TOSMetric field of a router LSA which is 65535. I think you and I are thinking of two different scenarios. Cheers, Don -----Original Message----- From: Mailing List [mailto:OSPF@PEACH.EASE.LSOFT.COM]On Behalf Of Erblichs Sent: Friday, July 30, 2004 6:20 PM To: OSPF@PEACH.EASE.LSOFT.COM Subject: Re: My virtual-link question Don, MAXAGE is used to withdraw a link from the LSDB. It is normally done when the SEQ is Maxed out. If a router is indeed OVERLOADED and unable to route even the fewest of transit packets and/or dst packets, then it is easily concieveable not to waste the bandwidth of to the destinations knowing those packets are going to be dropped anyway. Worst case is a drop at the last hop. You are in effect voluntering blackholing those routes until your router is able to advertise them again. It is a very drastic move which forces a new convergence to take place. It also assumes that you can still generate the advertisement. The same will happen if you don't refresh the routes in 1 hours timeframe. Please be aware that this is different from DNA (do not age) LSAs. The MAXCOST metric via the Stub Router Advertisement only minimizes the number of transit pkts, but with no alternatives does not decrease the amount of transit traffic. It does not effect pkts that are routed only to a dst that is attached thru the router. I thought you would like to see how to do both of your items. Mitchell Erblich ------------------- Don Goodspeed wrote: > > All, > > My excite account was on the fritz so I resubscribed with my work account. > > Mitchell, the last email I saw said advertise the link with MAXAGE. > > Did you mean to say MaxMetric (aka 0xffff)? > > -don
- Re: My virtual-link question Don Goodspeed
- Re: My virtual-link question Erblichs
- Re: My virtual-link question Don Goodspeed
- Re: My virtual-link question Erblichs
- Re: My virtual-link question Don Goodspeed