-----Original Message----- From: Mark Lastdrager [mailto:mark@pine.nl] Sent: Monday, September 04, 2000 11:48 To: Morgan Dollard Cc: 'routing-wg@ripe.net' Subject: RE: Routing comment At Mon, 4 Sep 2000, Morgan Dollard wrote:

...

But what if the ethernet interface dies? Your BGP session dies with it. For that reason it is advised to assign the BGP peer address to your loopback device and set the peering from that address.

Exactly, why would you want to keep sending trafic over that WAN link when the router's conection to the lan has failed?

;-) Routers can have more than one ethernet interface. Agreed, maybe i should have made a visio diagram to explain what i meant. I do agree that with 2 or more int interface you would have to use a loopback. In the case however (which is common practice for a lot of isps) where u have 2 paralel routers with 2 different bgp sessions over separate wan links to 2 different pops, runing HSRP between each other and single eth interface on each, the best way for the ISP to make sure that the customer site is still alive without having to use ping's is to make sure that is the eth goes down, the bgp sesion goes down, and the local pref at the POP will then send packets to the second pop's, without having to use back to back's between customer routers. Morgan Mark Lastdrager Pine Internet -- email: mark@lastdrager.nl :: ML1400-RIPE :: tel. +31-70-3111010 http://www.pine.nl :: RIPE RegID nl.pine :: fax. +31-70-3111011 PGP key ID 92BB81D1 :: Dutch security news @ http://security.nl Today's excuse: You've been infected by the Telescoping Hubble virus. Disclaimer ---------- This email and any files transmitted with it are confidential and are intended solely for the use of the individual or entity to whom they are addressed. This communication represents the originator's personal views and opinions, which do not necessarily reflect those of the NSC Group. If you are not the original recipient or the person responsible for delivering the email to the intended recipient, be advised that you have received this email in error, and that any use, dissemination, forwarding, printing, or copying of this email is strictly prohibited. If you received this email in error, please immediately notify administrator@nscglobal.com.