NEC IP8800/S3600, IP8800/S6600, IP8800/S2400, IP8800/S6700, IP8800/S6300 Checking MAC address table

3. Troubleshooting Functional Failures in Operation

that the identical MAC address is set in the configuration and is disabled.

#show vlan mac-vlan

:

VLAN ID:500	MAC Counts:4		0012.e200.aa02 (static)
0012.e200.aa01		(static)
0012.e200.aa03		(static)	0012.e200.aa04 (dot1x)
VLAN ID:600	MAC Counts:1

*0012.e200.aa01 (dot1x)

(2)Checking port status

•Execute the show vlan command with "detail" parameter specified, and confirm that the port is Up. If the port is Down, see "3.4 Network Interface Communication Failure."

•Confirm that the port is in the Forwarding status. If the port is in the Blocking status, the reason is shown in parentheses. Check the operation status of the function causing the problem.

[Cause]

VLAN: VLAN is specified to suspended.

CH: Forwarding is suspended by link aggregation.

STP: Forwarding is suspended by spanning tree.

GSRP: Forwarding is suspended by GSRP.

dot1x: Forwarding is suspended by IEEE802.1X.

CNF: Forwarding is suspended due to inability of configuration setting.

AXRP: Forwarding is suspended by Ring Protocol.

#show vlan detail

:

VLAN ID:100	Type:Protocol based		Status:Up
:
Port Information		Forwarding	Untagged
0/1	Up
0/2	Up	Forwarding	Tagged

(3) Checking MAC address table

(a) Checking MAC address learning status

•Execute the show mac-address-tablecommand to retrieve the information of the failed destination MAC address.

# show mac-address-table		Type	Port-list
MAC address	VLAN
0012.e22c.650c	10	Dynamic	0/1
0012.e22c.650b	1	Dynamic	0/2

•Take the action below according to the Type displayed.

[When Type displayed is Dynamic]

MAC address learning information may not be updated. Execute the clear mac-address-tablecommand to clear old information. The old information can be also cleared by sending frames from the destination system.

[When Type displayed is Static]

Check the forwarding destination port configured using configuration command mac-address-table static.

[When Type displayed is Snoop]

See "3.5.4 Multicast Relay by IGMP snooping Is Disabled" and "3.5.5 Multicast Relay by MLD snooping Is Disabled."

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