a.m.huq at aalto
May 27, 2011, 10:11 AM
Post #1 of 2
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Serious problem with community value
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Guys,
I have a serious problem with community attribute. I have 2 machines. Machine 2 has a C program that runs in a loop and sends two BGP update messages to Machine 1 separately. In other words, Machine 1 gets two community values over time. The C program uses “vtysh -c” to put the commands into Quagga. Now, the result of “sh running-config” in Machine 2 looks like:
Building configuration...
Current configuration:
!
hostname Router
hostname bgpd
log stdout
!
password zebra
enable password zebra
!
interface eth0
ipv6 nd suppress-ra
!
interface eth1
ipv6 nd suppress-ra
!
interface eth2
ipv6 nd suppress-ra
!
interface eth3
ipv6 nd suppress-ra
!
interface lo
!
router bgp 100
bgp router-id 192.168.56.101
network 10.10.30.1/32
network 192.168.57.0/24
timers bgp 0 0
neighbor 10.144.13.55 remote-as 7675
neighbor 10.144.13.55 route-map OUTBOUND out
neighbor 10.144.13.65 remote-as 7675
!
ip prefix-list PLIST1 seq 5 permit 0.0.0.0/0 le 32
!
route-map OUTBOUND permit 10
match ip address prefix-list PLIST1
set community 2420:0
!
ip forwarding
!
line vty
Now, as I have said, the C program sends two community values to machine 1. In machine 1, I get:
xTR# sh ip bgp community-info
Address Refcnt Community
[0x22112770] (1) 2420:0
[0x22112780] (1) 2274:0
What I need is to get only the latest value. i.e. I only want to see 2420:0. What can I do in machine 1 so that only the latest community value is seen? I did not use any “additive” keyword while sending the community attribute.
Also what’s the large Hexa number to the left of the community value? And what does “(1)” mean?
Please help.
Bye.
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