Configuring Physical Port Parameters - Avaya Cajun P882 User Manual

Chapter 5

Configuring Physical Port Parameters

5-10
PC2 is a member of VLAN2 and is connected to switch Port 2
SERVER1 is a member of VLAN4 and is connected to switch Port
4
With the set vlan CLI command, assign port 1, and port 2 to VLAN4
and also assign port 4 to VLAN1 and VLAN2. Then PC1 and PC2
could communicate with SERVER1 across VLANs without any
noticeable problems. However, when PC1 transmits a packet to
SERVER1, the following occurs:
The packet is sent to the Switch
The switch looks for the MAC address of SERVER1in the
Address Forwarding Table for VLAN1 (because this is the actual
port VLAN assigned to the port)
The switch will be unable to find an entry for the MAC address
of SERVER1
The switch will flood this packet to all ports assigned to VLAN1
(regardless of how the VLAN was assigned to the port)
*Note: The only exception to flooding a port is if 'Known
Mode' is set to enable on the port, which stops
the flooding of destination unknown unicast
packets.
If you had many clients/servers on separate VLANs and they tried to
communicate over multiple VLANs using this method, you would
flood your network with undesired packets, thus slowing your
overall network performance. Currently, the best solution is to use a
L3 module to route between the VLANs. This would eliminate the
broadcast of destination unknown unicast packets.
This section contains the following procedures:
Configuring Physical Port Parameters on Gigabit Ports
Configuring Physical Port Parameters on Fast Ethernet Ports
Using the All Ports Configuration Window
Avaya P550R, P580, P880, and P882 Multiservice Switch User Guide, Version v5.3.1