From: George Yiannibas (hintgy@hotmail.com)
Date: Sat Dec 13 2003 - 19:23:11 GMT-3
OK I admit I have not worked with BGP outside the Lab so here goes:
After setting up the BGP peering session from my customer's router to the
ISP border router and receiving the full Internet routing table I noticed
that the C class network I was trying to advertise to the outside world did
not appear on the ISP side. I double checked my configs and I made sure that
the ^$ regular expression in the route-map I was using to prevent the
transit domain issue (this network will be dual-homed in the near future)
was correct I started to wonder what went wrong. Then the ISP guy told me :
do you a have a static route to Null 0 ? Everything become suddenly clear to
me and I remembered BGP theory I had studied for the Lab: you cannot ever
advertise (even with sync turned off) a network under BGP which does not
appear in your routers' routing table. The C class network was not there so
it didnt appear in BGP as well. After I put in a static route to null 0 with
an administrative distance of 254 everything worked !
Yes I know we are not supposed to use these static routes int the Lab but
here I was in the Real World so I could do anything I liked to make my
scenario work (Huge grin).
George
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