Resolved Caveats - Release 12.4(2)XA2
CSCsc36118: The default route is removed if the one of multiple PPPoE session down
Symptoms: The default route is removed if the one of multiple PPPoE session down.
Conditions: This problem occurs when you configure multiple PPPoE which connect to the same BRAS or same LNS if using L2TP and ppp ipcp route default is configured using Cisco IOS Software Release 12.4(2)T1.
Workaround: There is no workaround. However, you can still turn routing on. For example, configure the multiple default routes pointing to the dialer interface(s) as the next hop.
Try:
http://www.cisco.com/en/US/products/ps6706/prod_release_note09186a0080527f26.html