Which Layer-2 links does a bridge on an AR router support

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A bridge on an AR router supports Ethernet, MP, PPP, FR, ATM, PPPoE, PPPoFR, PPPoEoA, and HDLC links.

Other related questions:
The AR router supports which layer 2 link
The AR router bridge supports ethernet link, MP, PPP, FR, ATM, PPPoE, PPPoFR, PPPoEoA, HDLC.

Which Layer 2 links do network bridges support
Network bridges support the following Layer 2 links: Ethernet, Multilink PPP (MP), Point-to-Point Protocol (PPP), frame relay (FR), Asynchronous Transfer Mode (ATM), Point-to-Point Protocol over Ethernet (PPPoE), Point-to-Point Protocol over FR (PPPoFR), Point-to-Point Protocol over Ethernet over ATM (PPPoEoA), and High-Level Data Link Control (HDLC) links.

Does a bridge group on an AR router forward packets in Layer 2 or Layer 3

A bridge group on an AR router forwards packets in Layer 2.
Only interfaces with Layer-3 functions can be added to a bridge. However, a bridge forwards data in Layer 2.

Does an AR router support an interface being switched over between Layer 2 and Layer 3
The following AR routers support an interface being switched over between Layer 2 and Layer 3. By default, Ethernet interfaces are Layer 2 interfaces. Run the undo portswitch command to switch the interfaces from Layer 2 mode to Layer 3 mode, and run the portswitch command to switch the interfaces back to Layer 2 mode. V200R006C00 and earlier versions: - AR150 and AR200 series: Eth0/0/0 - AR120-S series: Eth0/0/0~Eth0/0/3 - AR150-S, AR160-S, and AR200-S series (except for AR151-S2): Eth0/0/0 - AR151-S2: GE0/0/0 - AR160 series: GE0/0/0 - AR1220F: Eth0/0/0~Eth0/0/7 - AR2201-48FE, AR2202-48FE, and AR2201-48FE-S: Eth0/0/0 and Eth0/0/47 V200R007C00: - AR120 and AR150 series, AR120-S series, AR151-S, AR151W-P-S, and AR151G-U-S: Eth0/0/0~Eth0/0/3 - AR160 series, AR509G-L-D-H, AR110-S series, AR151-S2 and AR160-S series: GE0/0/0~GE0/0/3 - AR200 series, AR1220, AR1220V, AR1220W, AR1220VW, AR1220F, AR200-S series, AR1220-S, AR1220W-S, and AR1220F-S: Eth0/0/0~Eth0/0/7 - AR1220C, AR1220E, AR1220EV, AR1220EVW, and AR1220E-S: GE0/0/0~GE0/0/7 - AR2201-48FE and AR2202-48FE: Eth0/0/0~Eth0/0/47 - AR2204-51GE-P: GE0/0/3~GE0/0/50 - AR2204-27GE-P, AR2204-27GE, and AR2201-48FE-S: GE0/0/3~GE0/0/26 V200R008C00: - AR120 (except for AR129CGVW-L) and AR150 series, AR120-S series, AR151-S, AR151W-P-S, and AR151G-U-S: Eth0/0/0~Eth0/0/3 -AR100 series, AR160 series, AR129CGVW-L, AR503EW, AR503EDGW-Lc, AR509CG-Lt, AR509CG-Lc, AR509G-Lc, AR515GW-LM9-D and AR509G-L-D-H, AR100-S series, AR110-S series, AR151-S2 and AR160-S series: GE0/0/0~GE0/0/3 - AR200 series, AR1220, AR1220V, AR1220W, AR1220VW, and AR1220F, AR200-S series, AR1220-S, AR1220W-S, and AR1220F-S series: Eth0/0/0~Eth0/0/7 - AR1220C, AR1220E, AR1220EV and AR1220EVW, and AR1220E-S: GE0/0/0~GE0/0/7 - AR2201-48FE, AR2202-48FE, and AR2201-48FE-S: Eth0/0/0 and Eth0/0/47 - AR2204-51GE-P, AR2204-51GE-R, and AR2204-51GE: GE0/0/3~GE0/0/50 - AR2204-27GE-P and AR2204-27GE: GE0/0/3~GE0/0/26 At present, the interfaces of all cards do not support Layer 2 and Layer 3 interface switchover.

Does the E1 interface of an AR router support the layer 2 forwarding
The E1 interface of an AR router does not support the layer 2 forwarding because the protocol used by the E1 interface is different from the protocol used by the Ethernet over layer 2.

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