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Showing posts with label rene. Show all posts
Showing posts with label rene. Show all posts

Sunday, November 11, 2012

bgp on gns3vault...

if you haven't looked at gns3vault yet, you really should... rene has gone to a lot of effort to offer instructional labs that are challenging and great practice tools at once...

here is the latest one i did... http://gns3vault.com/BGP/ebgp-external-bgp.html


downloading his zips and scaling them to fit in a topology of your choosing is easy enough...  i've said before i like using 7200's so i find/replace his instances of 3640's, and change the idle pc value, the slots/interfaces, directories, then dump his configs into the same new directory, and i'm off... usually only takes a few minutes to whip up one of his labs into my environment; faster than building them from scratch...  i've found very few mistakes along the way... and gns3 will help you troubleshoot conversion mistakes if you pay attention to the console window...

i set up bgp as per jeremy cioara's guidance on his ccie youtube videos... i'm certain this is the preferred method... http://www.youtube.com/watch?v=xIYeBM3vTWo

i went further with rene's lab, you might say over configured... i like to add bgp only reachable loopbacks just to prove to myself that the igp isn't doing all the work...

Wool#sh ip bgp
BGP table version is 9, local router ID is 1.1.1.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
              r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
              x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

     Network          Next Hop            Metric LocPrf Weight Path
 *>  1.1.1.0/24       0.0.0.0                  0         32768 i
 *>  2.2.2.0/24       2.2.2.2                  0             0 2 i
 *>  3.3.3.0/24       2.2.2.2                                0 2 3 i
 *>  4.4.4.0/24       2.2.2.2                                0 2 3 4 i
 *>  11.11.11.0/24    0.0.0.0                  0         32768 i
 *>  22.22.22.0/24    2.2.2.2                  0             0 2 i
 *>  33.33.33.0/24    2.2.2.2                                0 2 3 i
 *>  44.44.44.0/24    2.2.2.2                                0 2 3 4 i

Wool#sh ip route ospf

Gateway of last resort is not set

      2.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
O        2.2.2.2/32 [110/2] via 192.168.12.2, 01:01:15, FastEthernet0/0
      3.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
O        3.3.3.3/32 [110/3] via 192.168.12.2, 00:53:54, FastEthernet0/0
      4.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
O        4.4.4.4/32 [110/4] via 192.168.12.2, 00:53:02, FastEthernet0/0
O     192.168.23.0/24 [110/2] via 192.168.12.2, 00:55:19, FastEthernet0/0
O     192.168.34.0/24 [110/3] via 192.168.12.2, 00:53:54, FastEthernet0/0

Silk#sh run | sec router
router ospf 1
 network 2.2.2.0 0.0.0.255 area 0
 network 192.168.12.0 0.0.0.255 area 0
 network 192.168.23.0 0.0.0.255 area 0
router bgp 2
 bgp log-neighbor-changes
 network 2.2.2.0 mask 255.255.255.0
 network 22.22.22.0 mask 255.255.255.0
 neighbor 1.1.1.1 remote-as 1
 neighbor 1.1.1.1 ebgp-multihop 2
 neighbor 1.1.1.1 update-source Loopback0
 neighbor 3.3.3.3 remote-as 3
 neighbor 3.3.3.3 ebgp-multihop 2
 neighbor 3.3.3.3 update-source Loopback0

the more i get used to bgp, the more i'm beginning to like it...