Cisco Systems A9014CFD manual EFPs and Switchport MAC Addresses, EFPs and Mstp

Chapter 8 Configuring Ethernet Virtual Connections

Configuring Other Features on EFPs

EFPs and Switchport MAC Addresses

Because forwarding can occur between EFPs and switchports, MAC address movement can occur on learned addresses. Addresses learned on EFPs will have the format of interface + EFP ID, for example gigabitethernet 0/1 + EFP 1. When an address moves between a non-secured EFP and a switchport, the behavior is similar to that of moving between switchports.

To see MAC address information for VLANs 1 to 4094, use the show mac address-table vlan privileged EXEC command. For VLANs 4096 to 8000, use the show mac address-tablebridge-domainprivileged EXEC command. All other show mac address-tablecommands also support bridge domains as well as VLANs.

When an EFP property changes (bridge domain, rewrite, encapsulation, split-horizon, secured or unsecured, or a state change), the old dynamic MAC addresses are removed from their existing tables. This is to prevent old invalid entries from getting retained.

EFPs and MSTP

EFP bridge domains are supported by the Multiple Spanning Tree Protocol (MSTP). These restrictions apply when running MSTP with bridge domains.

•All incoming VLANs (outer-most or single) mapped to a bridge domain must belong to the same MST instance or loops could occur.

•For all EFPs that are mapped to the same MST instance, you must configure backup EFPs on every redundant path to prevent loss of connectivity due to STP blocking a port.

•When STP mode is PVST+ or PVRST, EFP information is not passed to the protocol. EVC only supports only MSTP.

	Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
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