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
| Features | Description |
|---|---|
| Forwarding |
|
| Mirroring |
|
| VLAN |
|
Models
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 |
Abbreviations
FDB - Forwarding Database MDB - Multicast Database
Port Switching
Since v6.40rc29 on CRS3xx series switches 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 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] >
Features that support hardware offloading:
- Features in Switch menu
- Bridge STP/RSTP
- Bridge MSTP
- Bridge IGMP Snooping
- Bridge VLAN Filtering
Features that DON'T support hardware offloading:
- Bonding
Host Table
Sub-menu: /interface bridge host
| Property | Description |
|---|---|
| age (read-only: time) | The time since the last packet was received from the host |
| bridge (read-only: name) | The bridge the entry belongs to |
| external-fdb (read-only: flag) | Whether the host was learned using wireless registration table |
| local (read-only: flag) | Whether the host entry is of the bridge itself (that way all local interfaces are shown) |
| mac-address (read-only: MAC address) | Host's MAC address |
| on-interface (read-only: name) | Which of the bridged interfaces the host is connected to |
Example
To get the active host table:
[admin@MikroTik] /interface bridge host> print Flags: L - local, E - external-fdb BRIDGE MAC-ADDRESS ON-INTERFACE AGE bridge1 00:00:00:00:00:01 ether2 3s bridge1 00:01:29:FF:1D:CC ether2 0s L bridge1 00:0C:42:52:2E:CF ether2 0s bridge1 00:0C:42:52:2E:D0 ether2 3s bridge1 00:0C:42:5C:A5:AE ether2 0s [admin@MikroTik] /interface bridge host>
VLAN
TODO
STP/RSTP/MSTP
TODO
IGMP Snooping
IGMP Snooping which controls multicast streams and prevents multicast flooding is implemented in RouterOS starting from version 6.41.
It's settings are placed in bridge menu and it works independently in every bridge interface.
Software driven implementation works on all devices with RouterOS but CRS1xx/2xx/3xx series switches also support IGMP Snooping with hardware offloading.
Sub-menu: /interface bridge /interface bridge mdb
- Enabling IGMP Snooping on Bridge.
/interface bridge set bridge1 igmp-snooping=yes
- Monitoring multicast groups in the Bridge Multicast Database
[admin@MikroTik] > interface bridge mdb print
BRIDGE VID GROUP PORTS
bridge1 200 229.1.1.2 ether3
ether2
ether1
bridge1 300 231.1.3.3 ether4
ether3
ether2
bridge1 400 229.10.10.4 ether4
ether3
bridge1 500 234.5.1.5 ether5
ether1
[admin@MikroTik] >
Global Switch Settings
TODO
Port Settings
TODO
Switch Rules (ACL)=
TODO
See also
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