Re: My virtual-link question
Don Goodspeed <Don.Goodspeed@ALCATEL.COM> Sat, 31 July 2004 01:49 UTC
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Date: Fri, 30 Jul 2004 18:49:18 -0700
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From: Don Goodspeed <Don.Goodspeed@ALCATEL.COM>
Subject: Re: My virtual-link question
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Mitchell, Knowing that, I can now re-read your email and it makes complete sense now. MaxAge'ing the LSA on the "overload" router so NO paths are built thru it. Thanks, Don -----Original Message----- From: Mailing List [mailto:OSPF@PEACH.EASE.LSOFT.COM]On Behalf Of Erblichs Sent: Friday, July 30, 2004 6:37 PM To: OSPF@PEACH.EASE.LSOFT.COM Subject: Re: My virtual-link question Don, I was talking about two general methods of handling overload, thus it was a FYI... Doing one, both, or none is a implimentation issue for your company. Mitchell Erblich ---------------- Don Goodspeed wrote: > > 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