[Contents] [Prev] [Next] [Index] [Report an Error]

Rate Limiting for F5 OAM Cells

The router implements rate limiting for ATM F5 OAM cells to protect the corresponding ATM interface from denial-of-service (DoS) attacks. The interface discards control packets when the rate of control packets received exceeds the rate limit for ATM interfaces.

An ATM interface has a rate limit control that is non-configurable and always in effect; the rate limit is the same for all ATM interfaces. In addition, each ATM VC maintains its own state and statistics counters for tracking the rate. The rate limit for ATM OAM cells is approximately 5 packets per second.

For an ATM VC, the router increments the InOamCellDiscards statistics counter in the show atm vc atm command display to track the number of OAM cells received on this circuit that were discarded. The InOamCellDiscards counter operates on a per-circuit basis, not on a per-interface basis.

For examples of the show atm vc atm command display, see show atm vc atm.

[Contents] [Prev] [Next] [Index] [Report an Error]