ADVACNED TECHNOLOGY LABS : BGP BESTPATH SELECTION - WEIGHT

Friends, Please help on this...

 

- Traffic from AS 300 to AS 254 exists towards R6

- Traffic from AS 300 to AS 54 exists towards R3

After doing complete that lab, I enter [show ip bgp summary] command in R6, and I see that R6 doesn't receive any prefixes from SW1 (No ACL, No Security configuration, ...). I enter [show ip bgp neighbor (R6) advertise] command in SW1, and I see that SW1 still advertises prefixes as normal.

(I wait for 3 mins but there's nothing change in the State/PfxRcd of neighbor 155.1.67.7)


Rack1R6(config-router)#do sh ip bgp sum       
BGP router identifier 150.1.6.6, local AS number 100
BGP table version is 17, main routing table version 17
15 network entries using 1800 bytes of memory
26 path entries using 1352 bytes of memory
11/7 BGP path/bestpath attribute entries using 1364 bytes of memory
1 BGP rrinfo entries using 24 bytes of memory
3 BGP AS-PATH entries using 72 bytes of memory
1 BGP community entries using 24 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
Bitfield cache entries: current 2 (at peak 2) using 64 bytes of memory
BGP using 4700 total bytes of memory
BGP activity 15/0 prefixes, 29/3 paths, scan interval 60 secs

Neighbor        V    AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd
54.1.1.254      4    54      59      64       17    0    0 00:47:15       10
155.1.67.7      4   300      73      87       17    0    0 00:45:58        0
155.1.146.1     4   100      58      61       17    0    0 00:46:22       14

 ------------------

Rack1SW1(config-router)#do sh ip bgp nei 155.1.67.6 ad
BGP table version is 67, local router ID is 150.1.7.7
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
*> 28.119.16.0/24   155.1.37.3                           250 200 100 54 i
*> 28.119.17.0/24   155.1.37.3                           250 200 100 54 i
*> 112.0.0.0        155.1.67.6                             0 100 54 50 60 i
*> 113.0.0.0        155.1.67.6                             0 100 54 50 60 i
*> 114.0.0.0        155.1.37.3                           250 200 100 54 i
*> 115.0.0.0        155.1.37.3                           250 200 100 54 i
*> 116.0.0.0        155.1.37.3                           250 200 100 54 i
*> 117.0.0.0        155.1.37.3                           250 200 100 54 i
*> 118.0.0.0        155.1.37.3                           250 200 100 54 i
*> 119.0.0.0        155.1.37.3                           250 200 100 54 i
*> 155.1.0.0        155.1.67.6               0             0 100 i
*> 205.90.31.0      155.1.67.6                           250 100 200 254 ?
*> 220.20.3.0       155.1.67.6                           250 100 200 254 ?
*> 222.22.2.0       155.1.67.6                           250 100 200 254 ?

Can somebody explain that? :)

Thanks!

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This correction has been added to the most recent update to Entire Workbook Volume 1.013, due to be release this week.

--The Tech Edit Team 

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http://ieoc.com/forums/t/8056.aspx

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