07-15-2007 10:50 PM - edited 03-03-2019 05:52 PM
Hi
I have 2 routers connected via 2 serial links. To enable load balancing between the two i have configured EBGP using the loopback ips.
routerA
ip loopback lo 1.1.1.1 255.255.255.255
router bgp 64001
neighbor 2.2.2.2 remote-as 64002
neighbor 2.2.2.2 update-source loopback0
routerB
ip loopback lo 2.2.2.2 255.255.255.255
router bgp 64002
neighbor 1.1.1.1 remote-as 64001
neighbor 1.1.1.1 update-source loopback0
The loopbacks are reachable using static routes(not shown).
To enable load balancing between the 2 is it required to use ebgp-multihop command on both the routers?
If so why?
07-15-2007 11:07 PM
Hi
You will need to do 2 things
1) Enable ebgp multihop. This is because EBGP assumes that the neighbour is on a directly connected interface. if it isn't and in this case it isn't you need to tell EBGP that the neighbour interface is more than one hop away ie.
ebgp-multihop 2
2) You will also need to tell BGP to use multiple paths if you want load balancing to work. Attached is a link to a doc that explains this in detail.
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094431.shtml
HTH
Jon
07-15-2007 11:17 PM
HI, [Pls rate if HELPS]
Configure as below:
Router A:
neighbor 2.2.2.2 ebgp-multihop
!!You must configure eBGP multihop whenever the external BGP (eBGP) connections are not on the same network address
Router B:
neighbor 1.1.1.1 ebgp-multihop
Using "show ip route" verify the Load Balancing across both the Paths.
Pls Refer the Link below (for help):
http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a00800945bf.shtml#conf1
PLS Rate if HELPS
Best Regards,
Guru Prasad R
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