Set The Vlan Vpn Feature; Display And Debug Ethernet Port - 3Com 7700 Configuration Manual

Set the VLAN VPN
Feature
Display and Debug
Ethernet Port
Table 12 Set the Default VLAN ID for the Ethernet Port
Operation
Restore the default VLAN ID of the
trunk port to the default value
Note:
The Trunk port and isolate-user-vlan cannot be configured simultaneously,
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while the hybrid port and isolate-user-vlan can be thus configured. However, if
the default VLAN has been mapped in isolate-user-vlan, you cannot modify the
default VLAN ID until the mapping relationship has been removed.
To guarantee the proper packet transmission, the default VLAN ID of local
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hybrid port or Trunk port should be identical with that of the hybrid port or
Trunk port on the peer switch. The VLAN of hybrid port and trunk port is VLAN
1 by default. The access port is the VLAN to which it belongs.
A VLAN tag consists of 12 bits so Ethernet switches can support up to 4K VLANs.
In networking, a large number of VLANs are required to segment users. In many
cases, 4K VLANs are not enough.
The VLAN VPN feature can attach an addition VLAN tag to a packet to provide
4K x 4K VLANs to meet demands. At the same time. the VLAN VPN feature uses
the original VLAN tag to differentiate users and services, and uses the new VLAN
tag to load service and VPN users.
If VLAN VPN is enabled on a port, all the packets (regardless of whether it carries a
VLAN tag) is given a new tag that specifies the default VLAN of this port.
Therefore, the packets that have had a VLAN tag get two tags, and the packets
that have not had a VLAN tag, get one.
Perform the following configuration in Ethernet port view.
Table 13 Set the VLAN VPN Feature
Operation
Enable/Disable the VLAN VPN feature
Restore the default state
Note that if GVRP, GMRP, STP, 802.1x, NTDP, or NDP has been enabled on a port,
VLAN VPN cannot be enabled on it.
By default, the port VLAN VPN is disabled.
After configuration, execute the display command in all views to display the
current of the Ethernet port parameters, and to verify the configuration.
Execute the reset command in user view to clear the statistics from the port.
Execute the loopback command in Ethernet port view to check whether the
Ethernet port works normally. In the process of the loopback test, the port cannot
Ethernet Port Overview
Command
undo port trunk pvid
Command
vlan-vpn { enable | disable }
undo vlan-vpn
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