Allied Telesis x908 - Manual (Page 16)

Page 16 | AlliedWare Plus™ OS How To Note
Examples
Mirroring ARP packets
This example uses a QoS class-map.
Use this type of configuration when you want to mirror a subset of the incoming traffic on a
port, and you need to use QoS match commands to select the mirrored traffic.
Consider a situation where you want to capture ARP packets that arrive at port 1.0.10. To
configure this:
1. Set port 1.0.20 as the mirror port. To do this, enter global configuration mode and use the
commands:
awplus(config)#interface port1.0.20
awplus(config-if)#mirror interface none direction both
2. Create an ACL with an action of copy-to-mirror. This ACL will only be used to set the
action taken on the ARP traffic, not to select the traffic, so it needs to match all IP traffic.
To do this, return to global configuration mode and use the commands:
awplus(config)#access-list 3400 copy-to-mirror ip any any
3. Create a class-map that matches on ARP traffic and uses the ACL. To do this, use the
commands:
awplus(config)#class-map mirror-arp
awplus(config-cmap)#match protocol arp eth-format ethii-untagged
awplus(config-cmap)#match access-group 3400
4. Create a policy-map and add the class-map to it. To do this, use the commands:
awplus(config-cmap)#policy-map mirror-arp
awplus(config-pmap)#class mirror-arp
5. Apply the policy-map to port 1.0.10. To do this, use the commands:
awplus(config-pmap-c)#interface port1.0.10
awplus(config-if)#service-policy input mirror-arp