Jennifer,
I don't have the answer, but just some thoughts.
1. Offtopic--just a little bit: You can get about 1x10mb atm pipe for
what 4 T1s cost you {typically of course depending on where you
are}. You may want to check on that. Also, why {even from a mgt.
standpoint} would you want to use your smaller pipes, when they are
not cost effective compared to 45mb? My only thought is you have the
DS3 to a non-backbone ISP it's just a peering point w/ another
company?...Just guessing...
2. BGP4 will do load balancing: Caveat: You have to use Loopback
interfaces at both ends. See:
http://www.cisco.com/warp/public/459/13.html
and do a ctrl-f {find} and search for "ebgp multihop"
but the best example is at:
http://www.cisco.com/warp/public/459/12.html
3. Did a lot of reading on BGP never saw load determinants. IE: at
60% go to DS3. BGP is all about shortest path. _It is a DV protocol
after all_. Only instead of shortest path, it uses shortest AS set.
However, you can set weight, if you know the AS you get/send certain
trafic to. This can be applied to the inbound outbound See:
http://www.cisco.com/warp/public/459/14.html
search for "Weight Attribute"
For outbound only, see Local Preference right below, same bat channel.
But again, not a BGP guru...so if someone can point you to a load
determinant factor...pass the link on if you would. ;-)
TroyC
On 14 Aug 2000 21:18:11 -0400, [EMAIL PROTECTED] ("Jennifer Mellone")
wrote:
Here is our BGP setup with a single ISP:
external 7507 router (EBGP, AS yyy))
||
| 4 T1's | 1 DS3
||
ISP router#1 ISP router#2
(AS xxx) (AS xxx)
Here's what's happening: All inbound/outbound traffic is going through the
DS3, and no traffic is going through the T1s!
Here's what the manager wants: Load balancing with the DS3 and T1s (T1's not
a backup mechanism). He wants all 5 circuits to be used all the time. He
wants the T1's to be used first, for example, and when the load reaches 50%
on them (or any other %), the DS3 gets used. Kind of like dialer-load
threshold with ISDN ;-) I'm not aware of anything like that, are you? He
specifically wanted me to ask that question...
But I was thinking that the only way you could do load sharing is have the
T1's be preferred outbound (higher local-pref than DS3) and the DS3 inbound
(lower MED than T1). Currently on the router the route-maps set both
local-pref and MED inbound/outbound on all circuits! Not very clean.
- Jennifer Mellone, BGP rookie
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