eigrp cir bandwidth

http://hujnet.com/network/cisco/ccnp/bsci/2/004.htm

Treats bandwidth as T1 by default

　　　– Should manually configure bandwidth as the CIR of the PVC

　　* Bandwidth utilization over multipoint Frame Relay, ATM, and ISDN PRI:

　　　– EIGRP uses the bandwidth on the physical interface divided by the number of neighbors on that interface to calculate the bandwidth attributed per neighbor.

　　Cisco IOS software assumes that point-to-point Frame Relay subinterfaces (like all serial interfaces) operate at full T1 link speed. In many implementations, however, only fractional T1 speeds are available. Therefore, when configuring these subinterfaces, set the bandwidth to match the contracted committed information rate (CIR) of the permanent virtual circuit (PVC).

　　When configuring multipoint interfaces, especially for Frame Relay (but also for ATM and ISDN PRI), it is important to understand that all neighbors share the bandwidth equally. That is, EIGRP uses the bandwidth command on the physical interface divided by the number of
Frame Relay neighbors connected on that physical interface to calculate the bandwidth attributed to each neighbor. EIGRP configuration should reflect the correct percentage of the actual available bandwidth on the line.