[c-nsp] Full Routes / iBGP Issue & Question

[David Deutsch]

Hello all,

Please excuse my disorganized posting/question, as this is my first 
posting to the mailing list.

Currently I am attempting to implement two ASR1002-X routers on my 
network edge, each with diverse eBGP provider connections receiving full 
routes. Everything up to a point has gone very well, including reception 
of full routes, blocking of default routes, local prefs, etc. However I 
am getting some odd results when iBGP connecting the two together.

I appears that certain routes from each other are being filtered out, so 
each router is in some cases aware of both routes to a prefix and in 
some cases aware of only one. Examples:

edge01.las.telna.com#show ip bgp
...
*>  1.2.128.0/19     216.115.65.69                  80      0 23005 701 
38040 9737 i
  * i                  10.110.5.21              0     80      0 22911 
22822 38040 9737 i
  * i 1.2.128.0/18     10.110.5.21              0     80      0 22911 
22822 38040 9737 i
  *>                   216.115.65.69                  80      0 23005 
701 38040 9737 i
  * i 1.2.128.0/17     10.110.5.21              0     80      0 22911 
22822 38040 9737 i
  *>                   216.115.65.69                  80      0 23005 
19151 38040 9737 i
  *>i 1.2.160.0/19     10.110.5.21              0     80      0 22911 
22822 38040 9737 i
  *                    216.115.65.69                  80      0 23005 
19151 10026 38040 9737 i
  *>i 1.2.179.0/24     10.110.5.21              0     80      0 22911 
22822 38040 9737 9737 23969 i
  *>i 1.2.180.0/24     10.110.5.21              0     80      0 22911 
22822 38040 9737 9737 23969 i
  *>i 1.2.183.0/24     10.110.5.21              0     80      0 22911 
22822 38040 9737 9737 23969 i
  *>i 1.2.192.0/19     10.110.5.21              0     80      0 22911 
22822 38040 9737 i
  *>i 1.2.192.0/18     10.110.5.21              0     80      0 22911 
22822 38040 9737 i
  *>i 1.2.224.0/19     10.110.5.21              0     80      0 22911 
22822 38040 9737 i
  * i 1.3.0.0/24       10.110.5.21              0     80      0 22911 
174 10026 18046 i

edge02.las.telna.com#show ip bgp
*>  1.0.128.0/19     199.189.118.149                80      0 22911 
22822 38040 9737 i
  * i 1.0.128.0/18     10.110.5.11              0     80      0 23005 
3356 38040 9737 i
  *>                   199.189.118.149                80      0 22911 
22822 38040 9737 i
  * i 1.0.128.0/17     10.110.5.11              0     80      0 23005 
19151 38040 9737 9737 i
  *>                   199.189.118.149                80      0 22911 
22822 38040 9737 9737 i
  * i 1.0.129.0/24     10.110.5.11              0     80      0 23005 
19151 38040 9737 9737 9737 23969 i
  *>                   199.189.118.149                80      0 22911 
174 38040 9737 9737 9737 23969 i
  *>  1.0.160.0/19     199.189.118.149                80      0 22911 
22822 38040 9737 i

What I don't completely understand is why, when the two ASRs are in a 
iBGP relationship, some routes are showing on one unit and not the 
other. Additionally, routes like 1.2.128.0/19 will show both paths on 
one and not on the other.

edge01 show ip bgp neigh: http://pastebin.com/uv37gsmm
edge02 show ip bgp neigh: http://pastebin.com/Q9SiK1ZZ

edge01 bgp config: http://pastebin.com/rLRDTbDj
edge02 bgp config: http://pastebin.com/apsPLt3D

Any help would be highly appreciated!

--David Deutsch