Setup new BGP

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Feb 16th, 2010
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Couple of days ago we try to implement bgp between two isps, everything seems to working but somehow some users were not able to get into our network. please take a look on traceroute:


C:\Users\dmars.MA>tracert 204.90.52.106
  1     1 ms     1 ms     1 ms  192.168.1.1
  2     *        *        *     Request timed out.
  3     8 ms    10 ms    11 ms
ge-3-16-ur02.royaloak.mi.michigan.comcast.net [68.85.235.177]
  4    12 ms    10 ms    13 ms
te-9-2-ur03.royaloak.mi.michigan.comcast.net [68.87.191.18]
  5    12 ms     9 ms    11 ms
te-0-7-0-6-ar01.pontiac.mi.michigan.comcast.net[68.85.222.66]
  6    21 ms    23 ms    25 ms
pos-2-1-0-0-cr01.chicago.il.ibone.comcast.net [68.86.90.109]
  7    28 ms    24 ms    23 ms
pos-0-0-0-0-pe01.350ecermak.il.ibone.comcast.net [68.86.86.34]
  8    30 ms    23 ms    26 ms  192.205.37.9
  9    31 ms    34 ms    30 ms  cr1.cgcil.ip.att.net [12.122.84.50]
10    31 ms    33 ms    47 ms  cr81.dtrmi.ip.att.net [12.123.139.158]
11    30 ms    31 ms    30 ms  gar9.dtrmi.ip.att.net [12.122.102.13]
12    29 ms    30 ms    31 ms  12.87.190.18 (AT&T router)
13     *       33 ms    30 ms  12.51.172.2 (6509 Chassis)
14     *        *        *     Request timed out.
15     *        *        *     Request timed out.
16     *        *        *     Request timed out.
17     *        *        *     Request timed out.
18     *       33 ms     *     admin.starwoodcms.com [204.90.52.106]
19    33 ms     *        *     admin.starwoodcms.com [204.90.52.106]
20     *        *        *     Request timed out.
21     *        *        *     Request timed out.
22  12.51.172.2  reports: Destination host unreachable.


Whereas some users from different location and same service provider were able to connect.

One thing I noticed when I add a static route user ip address to my config then it work?

0.0.0.0  0.0.0.0  user ip

Let me know if I can provide any more details.


currently bgp turned off, because some users were not able to connect our network. Only one DS3 is working right now and I am collecting information again to make sure second time dont get into same problem... This is L3 network, and partial routes enable from both ISPs (AT&T and Cavalier).

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Giuseppe Larosa Tue, 02/16/2010 - 09:24
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Hello Raheel,


have you checked if the eBGP session has come up?


show ip bgp sum


do you see a number on righmost column like here:


x.x.x.x  4        ASN 1005968 25072159 85467919    0    0 6d08h        8584


on your side what tells about the new eBGP session


show ip bgp neigh received-routes


sh ip route bgp | inc via other-side-ipaddress


the fact that adding a default route may help is not clear


also check with sh ip route if all expected IP networks are present


is this a form of MPLS L3 VPN?


Hope to help

Giuseppe

lamav Tue, 02/16/2010 - 12:24
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Raheel, your post lacks a lot of information.


Can you show us the configuration of both peers?


Can you execute a sh ip bgp sum on each peer and show us the output?


Can you provide an example of a failed route?


Diagram?


Thanks


Victor

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