Manual:CRS3xx series switches
Applies to RouterOS: v6.41 +
Summary
The Cloud Router Switch series are highly integrated switches with high performance ARM CPU and feature-rich packet processor. The CRS switches can be designed into various Ethernet applications including unmanaged switch, Layer 2 managed switch, carrier switch and wired unified packet processing.
Warning: This article applies to CRS3xx series switches and not to CRS1xx/CRS2xx series switches.
| Features | Description |
|---|---|
| Forwarding |
|
| Mirroring |
|
| VLAN |
|
This table clarifies main differences between Cloud Router Switch models.
| Model | Switch Chip | CPU | Wireless | SFP+ port | Access Control List | Jumbo Frame (Bytes) |
| CRS326-24G-2S+ | Marvell-98DX3236 | 400MHz | - | + | + | 10218 |
| CRS317-1G-16S+ | Marvell-98DX8216 | 800MHz | - | + | + | 10218 |
Port Switching
Bridge Hardware Offloading
Since RouterOS v6.40rc29 there are user interface changes which convert RouterBoard master-port configuration into a bridge with hardware offloading.
From now on bridges will handle all Layer2 forwarding and the use of switch chip (hw-offload) will automatically turn on if appropriate conditions are met.
The rest of RouterOS Switch features remain untouched in usual menus.
By default all newly created bridge ports have hw=yes option and it allows enabling of hw-offload when possible. If such functionality is not required, it can be disabled by hw=no on bridge port to have completely software operated bridging.
Note: Downgrading to previous RouterOS versions will not restore master-port configuration. The bridge with no hw-offload will appear instead and master-port configuration will have to be redone from the beginning.
- Port switching with master-port configuration before v6.40rc29
[admin@MikroTik] > interface ethernet export /interface ethernet set [ find default-name=ether3 ] master-port=ether2 set [ find default-name=ether4 ] master-port=ether2 set [ find default-name=ether5 ] master-port=ether2 [admin@MikroTik] > [admin@MikroTik] > interface ethernet print Flags: X - disabled, R - running, S - slave # NAME MTU MAC-ADDRESS ARP MASTER-PORT SWITCH 0 R ether1 1500 D4:CA:6D:E2:64:64 enabled none switch1 1 R ether2 1500 D4:CA:6D:E2:64:65 enabled none switch1 2 RS ether3 1500 D4:CA:6D:E2:64:66 enabled ether2 switch1 3 RS ether4 1500 D4:CA:6D:E2:64:67 enabled ether2 switch1 4 RS ether5 1500 D4:CA:6D:E2:64:68 enabled ether2 switch1 [admin@MikroTik] >
- Port switching with bridge configuration and enabled hw-offload since v6.40rc29
[admin@MikroTik] > interface bridge export /interface bridge add name=bridge1 igmp-snooping=no protocol-mode=none /interface bridge port add bridge=bridge1 interface=ether2 add bridge=bridge1 interface=ether3 add bridge=bridge1 interface=ether4 add bridge=bridge1 interface=ether5 [admin@MikroTik] > [admin@MikroTik] > interface bridge port print Flags: X - disabled, I - inactive, D - dynamic, H - hw-offload # INTERFACE BRIDGE HW PVID PRIORITY PATH-COST INTERNAL-PATH-COST HORIZON 0 H ether2 bridge1 yes 1 0x80 10 10 none 1 H ether3 bridge1 yes 1 0x80 10 10 none 2 H ether4 bridge1 yes 1 0x80 10 10 none 3 H ether5 bridge1 yes 1 0x80 10 10 none [admin@MikroTik] >
Following table states what features currently in v6.40rc keep bridge hardware offloading enabled on certain RouterBoard and switch chip models.
Notes:
- Enabling this feature maintains hw-offload: +
- Enabling this feature turns off hw-offload: -
| RouterBoard/[Switch Chip] Model | Features in Switch menu | Bridge STP/RSTP | Bridge MSTP | Bridge IGMP Snooping | Bridge VLAN Filtering | Bonding |
| CRS3xx series | + | + | + | + | + | - |
| CRS1xx/CRS2xx series | + | + | - | + | - | - |
| [QCA8337] | + | + | - | - | - | - |
| [AR8327] | + | + | - | - | - | - |
| [AR8227] | + | + | - | - | - | - |
| [AR8316] | + | + | - | - | - | - |
| [AR7240] | + | + | - | - | - | - |
| RB750Gr3 [MT7621] | + | - | - | - | - | - |
| RB1100AHx4 [RTL8367] | + | - | - | - | - | - |
| [ICPlus175D] | + | - | - | - | - | - |
See also
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