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
