I believe I figured the weight statement out. I had not reset the frame-relay interface after setting the weight statement. When I did that it took affect. For testing I was only doing a shut on the direct serial interface. I had found the link below before and that is where I figured that by leaving everything at defaults the route would be chosen by the lowest neighbor IP address _____
From: Bryan Bartik [mailto:[email protected]] Sent: Sunday, July 05, 2009 9:58 PM To: Rob Cc: [email protected] Subject: Re: [OSL | CCIE_RS] EBGP path selection Rob, You must be familiar with the path selection process: http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094431 .shtml On Sun, Jul 5, 2009 at 8:03 PM, Rob <[email protected]> wrote: All, I have never spent a ton of time on BGP in a lab before so before I started work in the workbook I wanted to play with the different pieces in a simple setup. Right now I am only dealing with EBGP using the IPexpert lab setup. R2 and R5 are setup in the same fashion as vol 1 section 11 but using different BGP AS's. The problem I can not figure out is the path selection between R5 and R2. The both peer up and as you will see below default to go over the serial interface(150.100.25.0/24) between R2 and R5 for any paths on R1. If I shutdown that serial interface it falls back to the Frame-relay link. What I can not figure out is why if prefers the serial link with the network 150.100.25.0. I attempted to put a weight on the Frame-relay side as show below, but it still is sending traffic across the 150.100.25.0 network. Why is this? I assume without the weight statement the choice was made by lowest ip address. With the weight command I can not figure out at all. I thought weight won on on networks with multiple paths. Any help would be great. ----------------------------------------------------- R5 Gateway of last resort is not set 200.0.0.0/32 is subnetted, 3 subnets B 200.0.0.1 [20/0] via 150.100.25.2, 00:03:32 B 200.0.0.2 [20/0] via 150.100.25.2, 00:03:32 C 200.0.0.5 is directly connected, Loopback1 150.100.0.0/24 is subnetted, 5 subnets C 150.100.220.0 is directly connected, FastEthernet0/0 C 150.100.221.0 is directly connected, FastEthernet0/1 C 150.100.100.0 is directly connected, Serial0/0 C 150.100.25.0 is directly connected, Serial0/1 B 150.100.12.0 [20/0] via 150.100.25.2, 00:03:33 R5-2611XM#sh run | s bgp router bgp 135 no synchronization bgp log-neighbor-changes network 150.100.25.0 mask 255.255.255.0 network 150.100.100.0 mask 255.255.255.0 network 150.100.220.0 mask 255.255.255.0 network 150.100.221.0 mask 255.255.255.0 network 200.0.0.5 mask 255.255.255.255 neighbor 150.100.25.2 remote-as 132 neighbor 150.100.100.2 remote-as 132 neighbor 150.100.100.2 weight 33000 no auto-summary R5-2611XM#sh ip bgp BGP table version is 506, local router ID is 200.0.0.5 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale Origin codes: i - IGP, e - EGP, ? - incomplete Network Next Hop Metric LocPrf Weight Path *> 150.100.12.0/24 150.100.25.2 0 0 132 i * 150.100.100.2 0 0 132 i * 150.100.25.0/24 150.100.25.2 0 0 132 i * 150.100.100.2 0 100 132 i *> 0.0.0.0 0 32768 i * 150.100.100.0/24 150.100.25.2 0 0 132 i * 150.100.100.2 0 0 132 i *> 0.0.0.0 0 32768 i *> 150.100.220.0/24 0.0.0.0 0 32768 i *> 150.100.221.0/24 0.0.0.0 0 32768 i *> 200.0.0.1/32 150.100.25.2 0 132 22222 i * 150.100.100.2 0 132 22222 i *> 200.0.0.2/32 150.100.25.2 0 0 132 i * 150.100.100.2 0 0 132 i *> 200.0.0.5/32 0.0.0.0 0 32768 i -------------------------------------------------------------------- R2 R2_R2621#sh run | b 132 router bgp 132 no synchronization bgp log-neighbor-changes network 150.100.12.0 mask 255.255.255.0 network 150.100.25.0 mask 255.255.255.0 network 150.100.100.0 mask 255.255.255.0 network 200.0.0.2 mask 255.255.255.255 neighbor 150.100.12.1 remote-as 22222 neighbor 150.100.25.5 remote-as 135 neighbor 150.100.100.5 remote-as 135 no auto-summary Gateway of last resort is not set 200.0.0.0/32 is subnetted, 3 subnets B 200.0.0.1 [20/0] via 150.100.12.1, 02:06:56 C 200.0.0.2 is directly connected, Loopback1 B 200.0.0.5 [20/0] via 150.100.25.5, 00:10:09 150.100.0.0/24 is subnetted, 6 subnets B 150.100.220.0 [20/0] via 150.100.25.5, 00:10:09 B 150.100.221.0 [20/0] via 150.100.25.5, 00:10:09 C 150.100.100.0 is directly connected, Serial1/0.256 C 150.100.24.0 is directly connected, Serial1/0.24 C 150.100.25.0 is directly connected, Serial0/0 C 150.100.12.0 is directly connected, FastEthernet0/0 R2_R2621#sh ip bgp BGP table version is 266, local router ID is 200.0.0.2 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale Origin codes: i - IGP, e - EGP, ? - incomplete Network Next Hop Metric LocPrf Weight Path * 150.100.12.0/24 150.100.12.1 0 0 22222 i *> 0.0.0.0 0 32768 i * 150.100.25.0/24 150.100.25.5 0 0 135 i * 150.100.100.5 0 0 135 i *> 0.0.0.0 0 32768 i * 150.100.100.0/24 150.100.25.5 0 0 135 i * 150.100.100.5 0 0 135 i *> 0.0.0.0 0 32768 i *> 150.100.220.0/24 150.100.25.5 0 0 135 i * 150.100.100.5 0 0 135 i *> 150.100.221.0/24 150.100.25.5 0 0 135 i * 150.100.100.5 0 0 135 i *> 200.0.0.1/32 150.100.12.1 0 0 22222 i *> 200.0.0.2/32 0.0.0.0 0 32768 i *> 200.0.0.5/32 150.100.25.5 0 0 135 i * 150.100.100.5 0 0 135 i Checked by AVG - www.avg.com Version: 8.5.375 / Virus Database: 270.12.94/2207 - Release Date: 07/05/09 17:54:00 -- Bryan Bartik CCIE #23707 (R&S), CCNP Sr. Support Engineer - IPexpert, Inc. URL: http://www.IPexpert.com Checked by AVG - www.avg.com Version: 8.5.375 / Virus Database: 270.12.94/2207 - Release Date: 07/05/09 17:54:00
