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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