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RE: BGP Load Balancing Question [7:42469] posted 04/24/2002
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Are the t1's connected to different routers in the providers POP, or to
geographically diverse POP's?  Is the IP space your own ARIN assigned space
or the providers?  Do you take full bgp routes or just a default or partial
routes?  Any answer would depend on the answers to these questions.  As far
as seeing the real load balancing, use MRTG to graph the interfaces, that
will give you a good idea of how your bandwidth is being utilized.

~-----Original Message-----
~From: Jablonski, Michael [mailto:mike.jablonski@xxxxxxxxxxxxxx]
~Sent: Wednesday, April 24, 2002 5:49 PM
~To: cisco@xxxxxxxxxxxxxx
~Subject: BGP Load Balancing Question [7:42469]
~
~
~I am experiencing a similar problem, using one provider with two T1s.
~Utilization appears to significantly favor one interface over 
~the other.  I
~realize there will be some variation, but considering its a 
~discrepancy of
~75% vs. 3% (these are numbers from our provider)....  I've 
~talked to the
~provider; each time I receive a different configuration.
~
~Is there a command that would better show the load 
~balancing/utilization
~rates.  I'm trying to become more familiar with BGP through my 
~CCNP studies,
~but haven't gotten that far yet....   Thanks in advance for the help!
~
~
~
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~Michael Jablonski
~ABN AMRO Asset Management Holdings, Inc.
~161 North Clark St.
~9th Flr
~Chicago, IL  60601-2468
~PH: 312.884.2996 
~FAX: 312.278.5550
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~
~
~
~
~
~
~
~-----Original Message-----
~From: Michael Bray [mailto:mbray@xxxxxxxxxx]
~Sent: Wednesday, April 24, 2002 2:17 PM
~To: cisco@xxxxxxxxxxxxxx
~Subject: BGP route selection question [7:42456]
~
~
~I have a router that is running BGP to two different providers...  When
~I show the bgp entry for two different routes, it shows that one
~provider is selected for one route, and the other provider is selected
~for the other route, even though they seem to have the same AS path
~length from each provider.  There isn't any difference as far as I can
~tell for MED or local preference settings or anything like that...
~The route on the bottom looks normal - its being chosen (I assume)
~because the 64.*.*.* has the lower router ID (207.* instead of 208.*).
~The first entry is the one that doesn't make sense to me - shouldn't it
~also be selecting the 64.* router, by virtue of its lower ID?  I see
~that there are different values for the "version", but I'm not 
~sure this
~would have anything to do with it??
~
~rtr#show ip bgp 64.170.96.0/19
~BGP routing table entry for 64.170.96.0/19, version 16127
~Paths: (2 available, best #2, table Default-IP-Routing-Table)
~  Not advertised to any peer
~  4323 1239 5673
~    64.132.248.89 from 64.132.248.89 (207.67.76.17)
~      Origin IGP, localpref 100, valid, external
~  3561 1239 5673
~    208.174.151.61 from 208.174.151.61 (208.172.66.20)
~      Origin IGP, localpref 100, valid, external, best
~
~rtr#show ip bgp 12.3.59.0
~BGP routing table entry for 12.3.59.0/24, version 742
~Paths: (2 available, best #2, table Default-IP-Routing-Table)
~  Not advertised to any peer
~  3561 4513 17304
~    208.174.151.61 from 208.174.151.61 (208.172.66.20)
~      Origin IGP, localpref 100, valid, external
~  4323 4513 17304
~    64.132.248.89 from 64.132.248.89 (207.67.76.17)
~      Origin IGP, localpref 100, valid, external, best
~
~ip classless
~ip route 0.0.0.0 0.0.0.0 208.174.151.61
~ip route 0.0.0.0 0.0.0.0 64.132.248.89
~ip as-path access-list 78 permit ^$
~
~
~-Mike Bray
~mbray@xxxxxxxxxx
~This message (including any attachments) is confidential and may be 
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~the sender 
~by return e-mail and delete this message from your system. Any 
~unauthorized use or dissemination of this message in whole or in part 
~is strictly prohibited. Please note that e-mails are susceptible to 
~change. ABN AMRO Bank N.V. (including its group companies) 
~shall not be 
~responsible nor liable for the proper and complete transmission of the 
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~---------------------------------------------------------------
~---------
~
~
~
~




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