I thought some of you guys might be interested in this Please go to www.nantech.com/software for more information about the software.
-----Original Message----- From: Alan Kucharski [mailto:[EMAIL PROTECTED]] Sent: Monday, August 05, 2002 3:41 PM To: [EMAIL PROTECTED] Subject: Re: What the heck is BGP Next Hop Propagation? [7:50704] Dennis, Propagate NEXT_HOP unchanged to eBGP Ability to advertise BGP prefixes to an eBGP peer without modifying the next-hop value Used in VPN and non-VPN MPLS networks to set up end-to end LSPs Ability to set NEXT_HOP on a RR Ability to set the next-hop to self on a RR when reflecting a path. The neighbor x.x.x.x next-hop-self command will only effect routes from eBGP peers (i.e. non-reflected routes) The next-hop can only be modified for a reflected route via an outbound route-map set ip next-hop 1.1.1.1 Why would you want to modify the next-hop of a reflected route? If RR (the route-reflector) is using iBGP multipath then traffic from R4 needs to come through RR for load-balancing purposes If RR does not set the next-hop to self, all traffic from R4 will go straight to R2 R4---------RR---------R2 | | |_______R3 RR# router bgp 100 neighbor 4.4.4.4 route-reflector-client neighbor 4.4.4.4 route-map foo out ! route-map foo permit 10 set ip next-hop 1.1.1.1 Codes that support the next hop modification for an EBGP neighbor: This is id CSCdt84706 and is integrated in 12.1(9), 12.1(9)E, 12.1(9)EC -Alan. At 04:26 PM 8/5/2002 -0700, Dennis Laganiere wrote: >In a semi-random CCO search I came across "BGP Next Hop Propagation", but >reading over the few links I've found isn't enough for me to figure it out. >I've looked through several BGP books and found nothing. I also tried an >archive search without results. Anybody seen this before? (I've got to find >a new hobby... :-) > >--- Dennis >_________________________________________________________________ >Commercial lab list: http://www.groupstudy.com/list/commercial.html >Please discuss commercial lab solutions on this list. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=50977&t=50977 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
