Configuration restrictions and guidelines
When you configure transparent bridging over ATM, you must enable transmission and receiving of bridged frames on the PVC.
When you configure transparent bridging over PPP, you must configure PPP on the interface as the link layer protocol for interface encapsulation.
When you configure transparent bridging over multilink PPP (MP), you must configure PPP on the interface as the link layer protocol for interface encapsulation, create a virtual template interface and associate the physical interface with the virtual template interface.
When you configure transparent bridging over FR, you must configure FR on the interface as the link layer protocol for interface encapsulation, configure the FR interface type (optional, DTE by default) and configure a virtual circuit. When establishing transparent bridging over FR, you must configure mappings between bridge addresses and data link connection identifier (DLCI) addresses.
When you configure transparent bridging over X.25, you must configure X.25 on the interface as the link layer protocol for interface encapsulation and configure the operating mode and datagram format of the interface. When establishing transparent bridging over X.25, you must configure mappings between bridge addresses and X.25 addresses defined in X.121.
When you configure transparent bridging HDLC, you must configure HDLC as the link layer protocol for interface encapsulation.
When you configure inter-VLAN transparent bridging, you must configure the encapsulation format of the Ethernet subinterfaces and the VLAN IDs. When establishing inter-VLAN transparent bridging, you must add the configured Ethernet subinterfaces into a bridge set.