Alcatel Carrier Internetworking Solutions 6600 manual Application Example 2 Inter-Switch HA VLANs

Configuring High Availability VLANs

Application Example 2: Inter-Switch HA VLANs

This section describes how to implement an HA VLAN configuration across two switches. As shown in the figure below:

•Ports 3/7 and 5/4 connect Switch 1 and Switch 2. Because these ports are both tagged with HA VLAN 5 (not shown), they function as inter-switch ports for VLAN 5.

•Traffic from VLAN 5 will flow in both directions through the inter-switch link provided by the 3/4 and 5/7 connection.

•VLAN 5 has three ingress ports (2/5, 2/6, and 2/7) and three egress ports (4/10, 4/11, and 4/12) on Switch 1 and three egress ports (1/1, 1/2, and 1/3) on Switch 2. In addition, VLAN 5 is also configured with an HA VLAN destination MAC address (00:da:53:71:02:35) on both switches.

•The HA VLAN ingress flood queue bandwidth size is limited to 100 Mbps.

•Traffic destined for 00:da:52:71:02:35 that is received on VLAN 5 ingress ports is forwarded to the VLAN 5 egress ports on Switch 1 and across the inter-switch link to VLAN 5 egress ports on Switch 2.

Note that traffic received on any ingress ports that is not destined for the HA VLAN MAC is forwarded according to switching rules.

4/10 4/11 4/12		1/1 1/2 1/3
	Switch 1		Switch 2

2/5	VLAN 5	3/7	5/4
2/6	00:da:52:71:02:35
2/7

VLAN 5

00:da:52:71:02:35

Ingress Traffic Flow Egress Traffic Flow

HA VLAN Inter-Switch Configuration

Follow the steps below to configure this example inter-switch HA VLAN implementation:

1Create a default VLAN for HA VLAN 5 ports on both Switch 1 and Switch 2 with the vlan command as shown below:

-> vlan 2

2Assign ports to the new default VLAN on Switch 1 with the vlan port default command as shown below:

-> vlan 2 port default 2/5-7 3/7 4/10-12

3Assign ports to a new default VLAN on Switch 2 with the vlan port default command as shown below:

Release 5.1.6.R02 User Guide Supplement June 2005 page 3-17