I configure Cisco routers for:

T1 connectivity (both frame relay and point-to-point)
BGP to upstream providers, peers, and internally where needed
EIGRP (cisco-proprietary internal routing protocol)
Load-balancing of traffic toward upstream providers, both BGP and non-BGP environments
Load-balancing of inbound traffic in multihomed BGP environments, where feasible
Stateless firewalling using Cisco router extended access lists


I can troubleshoot Cisco router based networks for:

Routing loops
Nonrouting local netblocks
Nonrouting internet-located netblocks
Route propogation problems