MAC Address Withdrawal

L2 Ethernet switching includes a mechanism called MAC aging that lets MAC addresses be aged out of an Ethernet switch MAC table after a certain period of inactivity. In some cases, such as an MTU building that is dual-homed to two different Ethernet switches in the central office (CO), faster convergence can occur if a mechanism exists to age out (withdraw) or relearn MAC addresses in a way Chat .s faster than the traditional L2 MAC aging. The IETF has defined a MAC type length value (TLV) field that can be used to expedite learning of MAC addresses as a result m0 topology change.

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