I have a BGP setup to a single ISP that I want to switch from Shadow T1 to multihomed so I can use both T1's at the same time.
I've posted the config for Shadow below. Of course I removed passwords, ACL list, and renumbered the networks.
With the config below, I had all incoming traffic coming from one of the T1's, and all outgoing traffic going out over the other. If either link failed, BGP would switch traffic from which ever T1 failed over to the other T1.
I want to modify this configuration to allow both T1's to run at the same time, so I can get some additional bandwidth.
I've talked to my ISP and they stated that this is fine, that all the power is in my config on my router and there is nothing they need to do. What I gather I need to change is; ip route 0.0.0.0 0.0.0.0 Serial0/1.1 10 to ip route 0.0.0.0 0.0.0.0 Serial0/1.1
and then add to the section; router bgp 1234 the line maximum-paths 2
Is that it? Any thing else? My ISP mentioned that with BGP I might need to poison the routes. With maximum-paths 2, won't BPG start load sharing over both T1's?
Edwin
service timestamps debug uptime service timestamps log uptime service password-encryption ! hostname removed ! boot-start-marker boot-end-marker ! ! no network-clock-participate slot 1 no network-clock-participate wic 0 no aaa new-model ip subnet-zero ip cef ! ! ip name-server 1.2.3.4 ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! interface FastEthernet0/0 description connected to EthernetLAN ip address 177.1.1.180 255.255.255.240 duplex auto speed auto ! interface Serial0/0 no ip address encapsulation frame-relay IETF service-module t1 timeslots 1-24 service-module t1 remote-alarm-enable frame-relay lmi-type ansi ! interface Serial0/0.1 point-to-point description connected to St_Louis bandwidth 1536 ip address 2.2.3.94 255.255.255.252 ip access-group 101 in ip accounting access-violations frame-relay interface-dlci 500 ! interface FastEthernet0/1 no ip address shutdown duplex auto speed auto ! interface Serial0/1 no ip address encapsulation frame-relay IETF service-module t1 remote-alarm-enable frame-relay lmi-type ansi ! interface Serial0/1.1 point-to-point description connected to Kansas_City ip address 2.2.3.98 255.255.255.252 ip access-group 110 in ip accounting access-violations frame-relay interface-dlci 500 ! router rip version 2 network 157.130.0.0 network 208.248.194.0 no auto-summary ! router bgp 1234 no synchronization bgp log-neighbor-changes network 10.10.10.180 mask 255.255.255.240 network 177.1.1.176 mask 255.255.255.240 neighbor 2.2.3.93 remote-as 111 neighbor 2.2.3.97 remote-as 111 neighbor 2.2.3.97 route-map shadow in neighbor 2.2.3.97 route-map shadow out no auto-summary ! no ip http server ip classless ip route 0.0.0.0 0.0.0.0 Serial0/0.1 ip route 0.0.0.0 0.0.0.0 Serial0/1.1 10 ip route 10.10.10.180 255.255.255.240 177.1.1.182 ip route 177.1.1.176 255.255.255.240 FastEthernet0/0 ! ! logging history warnings route-map shadow permit 10 ! ! ! ! ! ! ! ! ! end