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It is the same as the built-in MAC address (BIA) for this SRP interface. In the show interface output, the MAC address is 0000.4142.8799.

Received 0 broadcasts, 0 runts, 0 giants, 0 throttlesġ12289 input errors, 54938 CRC, 0 frame, 0 overrun, 0 ignored, 57351 abortġ943503 packets output, 67532068 bytes, 0 underrunsĠ output errors, 0 collisions, 1 interface resetsĠ output buffer failures, 0 output buffers swapped out Program MAC Addresses for SRP Interfaces Output queue 0/40, 0 drops input queue 0/75, 0 dropsĥ minute input rate 0 bits/sec, 1 packets/secĥ minute output rate 0 bits/sec, 0 packets/secģ56572 packets input, 7674965 bytes, 0 no buffer Last clearing of "show interface" counters never Side B: wrapped IPS local: IDLE IPS remote: IDLE Side A: not wrapped IPS local: SF IPS remote: IDLE MTU 4470 bytes, BW 622000 Kbit, DLY 100 usec, rely 255/255, load 1/255ģ nodes on the ring MAC passthrough not set These two MACs actually form one SRP interface that consists of an A side and a B side.įor example: Node2# show interface srp 4/0 One SRP interface on any SRP line card (LC) has two MACs, but only one MAC address. Refer to Cisco Technical Tips Conventions for more information on document conventions. If your network is live, make sure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration.

The information in this document was created from the devices in a specific lab environment. This document is not restricted to specific software and hardware versions. There are no specific requirements for this document. This document explains SRP interface relations, which is the most frequent reason for misinterpretation of MAC addresses. Topology packets transmit on the outer ring except when some node on the ring is in a wrap condition. In the event of a failed node or a fiber cut, the data transmits over the alternate ring. A dual fiber-optic ring provides a high level of packet survivability. Control packets, such as keep-alives, protection switching, and bandwidth control propagation, propagate in the opposite direction from the corresponding data packets to ensure that the data takes the shortest path to its destination.

Both are concurrently used to carry data and control packets. An SRP ring consists of two counter-rotating fibers, known as the outer and inner ring. Spatial Reuse Protocol (SRP) is a Cisco-developed MAC-layer protocol used in ring configurations.