I am attempting to configure two T1's using MLPPP on a Cisco 1841 running IOS 12.4(1a). I have two WIC-1DSU-T1-V2 cards connected to two T1's at my ISP. The ISP says that the MLPPP is configured correctly on their end, and I'm trying to configure my end to get all the interfaces up. Without the interfaces in the Multilink Group, both T1's are up/up, but when adding the two serial interfaces to the Multilink Group, the first one added always goes to up/up, but the second interface to be added (it doesn't matter which interface) always goes to up/down. I am not able to get up/up on all interfaces. Am I missing something? Basically, I can only get one serial interface to become an active member in the bundle at any given time.
Below is a copy of the relevant parts of my config. My ISP is telling me that I need to call Cisco because it is a problem with my router or my IOS. Is this the case? If anyone has any insight it would be greatly appreciated.
SH RUN: interface Multilink1 ip address x.x.x.x x.x.x.x ppp chap hostname group1 ppp multilink ppp multilink fragment disable ppp multilink group 1 ! interface Serial0/0/0 no ip address encapsulation ppp ppp chap hostname group1 ppp multilink ppp multilink group 1 ! interface Serial0/1/0 no ip address encapsulation ppp ppp chap hostname group1 ppp multilink ppp multilink group 1
SH IP INT BRIE: Serial0/0/0 unassigned YES NVRAM up up Serial0/1/0 unassigned YES NVRAM up down Multilink1 x.x.x.x YES NVRAM up up
SH PPP MULTI: Multilink1, bundle name is group1 Endpoint discriminator is group1 Bundle up for 00:05:20, 1/255 load Receive buffer limit 12000 bytes, frag timeout 1000 ms 0/0 fragments/bytes in reassembly list 1 lost fragments, 1 reordered 0/0 discarded fragments/bytes, 0 lost received 0xB24 received sequence, 0x0 sent sequence Member links: 1 active, 1 inactive (max not set, min not set) Se0/0/0, since 00:45:33 Se0/1/0 (inactive)