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Dynamic MAC Address Learningĭynamic MAC address learning occurs when the bridging data path encounters an ingress frame whose source address is not present in the MAC address table for the ingress service instance. The expected MAC address age out timer is between 300 to 600 seconds depending on the number of MAC addresses learned. In CPT, the default value for MAC address aging is 300 seconds and cannot be changed. This frees up unused addresses from the MAC address table for other active subscribers. See NTP-J7 Enable or Disable MAC Learning on a Bridge Domain.ĭynamically learned MAC addresses are deleted after the MAC address age out value.

Noteīy default, MAC address learning is enabled only for point–to–multipoint bridge domains and can also be disabled. This MAC address table is used to distribute the MAC addresses when the line card reboots or goes through Online Insertion and Removal (OIR).

This MAC address table contains the MAC addresses learned on all the line cards. The MAC learning feature enables the distribution of the MAC addresses learned on one line card to the other line cards.Ī software MAC address table is maintained on the fabric cards. The MAC addresses learned on one line card needs to be learned or distributed on the other line cards. The Carrier Packet Transport (CPT) system is a distributed system with fabric cards, line cards, and CPT 50 panels. This chapter also describes the configuration procedures. This chapter describes MAC learning, MAC address limiting, and static MAC address. DLP-J28 Display Information About the MAC Address Table Using CTC.DLP-J27 Display Information About the MAC Address Table Using Cisco IOS Commands.NTP-J11 Display Information About the MAC Address Table.DLP-J25 Remove a MAC Address Using Cisco IOS Commands.DLP-J24 Configure a Static MAC Address on a Service Instance Using CTC.DLP-J23 Configure a Static MAC Address on a Service Instance Using Cisco IOS Commands.NTP-J9 Configure a Static MAC Address on a Service Instance.DLP-J22 Configure the MAC Address Limit on a Bridge Domain Using CTC.DLP-J21 Configure MAC Address Limit on a Bridge Domain Using Cisco IOS Commands.NTP-J8 Configure MAC Address Limit on a Bridge Domain.DLP-J20 Re-enable or Disable MAC Learning on a Bridge Domain Using CTC.