Install guide

MAC-Forced Forwarding 7
Monitoring and Troubleshooting
To see a summary of the VLANs with MAC-Forced Forwarding enabled, use
the command:
show macff [counter]
To see details about a specific VLAN, use the command:
show macff interface=vlan
To see detailed counters for the traffic flowing through a VLAN, or through
specific ports on a VLAN, use the command:
show macff interface=vlan [port=port-list] counter
To see a detailed list of clients in the DHCP snooping database, use the
command:
show dhcpsnooping database
To see a detailed list of the ARs and ASs held in the database, use the
command:
show macff database
Debugging
The MAC-Forced Forwarding debugging feature allows you to generate
information useful for troubleshooting VLANs on the EAN. To enable or
disable debugging, use the commands:
enable macff interface=vlan
debug={all|arp|dhcp|error|packet|server|trace}
disable macff interface=vlan
debug={all|arp|dhcp|error|packet|server|trace}
Logging
MAC-Forced Forwarding automatically generates log messages to record
when:
■ an AR or AS is added or removed from the DHCP snooping database
■ the MAC address for any routers associated with a client cannot be
resolved
■ a client ARP request arrives when the client has no ARs associated with it
■ a routine poll of the DHCP snooping database shows that an AR or AS is
unavailable
■ one of the above log types is generating an excessive amount of logs; the
log type is temporarily suspended
DHCP snooping also generates log messages that are related to MAC-Forced
Forwarding, such as when a client is added to or removed from the DHCP
snooping database.