[c-nsp] BGP blackhole community config

Satish Patel satish.txt at gmail.com
Sun Jun 19 19:37:47 EDT 2016

We have setup new BGP configuration with ISP and ISP has been told
send community "64682:0" for blackholing. I am new in BGP.

I was reading BGP community format is ASN:NN but my ISP ASN number
isn't 64682 so i am assuming they gave me example (64682:0)

This is what i configure in my router.

router bgp 100
 bgp log-neighbor-changes
 redistribute static route-map RTBH
 neighbor xx.xx.xx.xx remote-as 200

route-map RTBH permit 10
 match tag 666
 set community <ISP_ASN>:666

route-map RTBH permit 20

I have send following null route but it didn't work :(

ip route xx.x.x.xx Null0 tag 666

what i am doing wrong? how do i use community to send blackhole route?

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