nanog mailing list archives
Re: Top-50 Report
From: "Mr. Jeremy Hall" <jhall () rex isdn net>
Date: Mon, 16 Sep 1996 08:43:52 -0500 (CDT)
--> -->> -->> -->> There is no question that more people are needing more reliable -->> connections to the net. With some education, tools, and the right -->> pricing models, people can be encouraged to get backup connectivity in -->> a manner that doesn't impact the size of the routing table. -->> Specifically, they should not announce any routes on their backup -->> connection unless their primary is down. ISPs should provide --> -->Is there some trick here or are you saying that a duel homed ISP should -->manually update their announcements when their primay pipe is down? I -->think that, in theory, your statement makes sense, but I don't know how -->one accomplishes it in practice. Outbound traffic is easy, but if one is -->duel homed and wishes to have inbound traffic find their network "quickly" -->and dynamically when their primary pipe is down, I believe it is necessary -->to advertise ones routes via ones backup at all times. --> -->Jim --> You might be able to set the backup interface in backup mode or standby mode or whatever cisco calls it, I don't remember. Anyway, if your primary line drops, the backup line would come up. Since the backup line would come up, you would begin peering with the backup peer. At this time, you would probably want to decide how much of a backup you want your backup to be. At what point do you declair an emergency and begin routing via your backup? I agree with the person who stated it earlier, the one saying that he'd rather use a backup all the time so he'd know whether a problem would come up when he needed his backup the most. Where this gets nasty is when your main ISP is having trouble peering at the peer points and so your connection is not down. At this time, I don't see how you could only announce to one peer at a time without a change in software. -- ------------------------------------------- | Jeremy Hall Network Engineer | | ISDN-Net, Inc Office +1-615-371-1625 | | Nashville, TN and the southeast USA | | jhall () isdn net Pager +1-615-702-0750 | ------------------------------------------- - - - - - - - - - - - - - - - - -
Current thread:
- Re: Top-50 Report, (continued)
- Re: Top-50 Report Tony Bates (Sep 14)
- Re: Top-50 Report Paul A Vixie (Sep 14)
- Re: Top-50 Report Tony Bates (Sep 14)
- Re: Top-50 Report Neil J. McRae (Sep 14)
- Re: Top-50 Report Jon Zeeff (Sep 14)
- Re: Top-50 Report Jim Van Baalen (Sep 16)
- Re: Top-50 Report Mr. Jeremy Hall (Sep 16)
- Re: Top-50 Report Jon Zeeff (Sep 16)
- Re: Top-50 Report Dean Gaudet (Sep 14)