Does an AR router support an interface being switched over between Layer 2 and Layer 3

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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.

Other related questions:
How is an interface on an NE router switched between Layer 2 and Layer 3 modes
By default, an Ethernet interface of a Layer 3 device, such as a router, usually works in Layer 3 mode. To add the interface to a VLAN or perform other Layer 2 interface configurations, you must run the portswitch command to switch the Layer 3 interface to the Layer 2 mode. To switch the Layer 2 mode back to the Layer 3 mode, run the undo portswitch command. To switch Ethernet interfaces from the Layer 3 mode to the Layer 2 mode in batches, run the portswitch batch command. To switch Ethernet interfaces from the Layer 2 mode to the Layer 3 mode in batches, run the undo portswitch batch command.

Does the Ethernet LAN interface card of an AR router provide Layer-2 interfaces or Layer-3 interfaces
All interfaces provided by the Ethernet LAN interface card of an AR router are Layer-2 Ethernet interfaces. Ethernet LAN cards of AR routers include the following models: 8FE1GE: a WSIC card that provides 8 FE interfaces and a GE interface 9ES2: a WSIC card that provides 8 FE electrical interfaces and a GE electrical interface 24GE: an XSIC card that provides 24 GE electrical interfaces 4GE-2S: a WSIC card that provides 4 GE optical interfaces 4ES2G-S: a SIC card that provides 4 GE electrical interfaces 4ES2GP-S: a SIC card that provides 4 GE electrical interfaces

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.

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