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Configuring High Availability VLANs
Release 5.1.6.R02 User Guide Supplement June 2005 page 3-17
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.
HA VLAN Inter-Switch Configuration
Follow the steps below to configure this example inter-switch HA VLAN implementation:
1 Create a default VLAN for HA VLAN 5 ports on both Switch 1 and Switch 2 with the vlan command
as shown below:
-> vlan 2
2 Assign 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
3 Assign ports to a new default VLAN on Switch 2 with the vlan port default command as shown
below:
OmniSwitch 7800 OmniSwitch 7800
VLAN 5
3/7
5/4
2/5
2/6
2/7
4/10
4/11
4/12
00:da:52:71:02:35
VLAN 5
00:da:52:71:02:35
1/1
1/2
1/3
Ingress Traffic Flow
Switch 1 Switch 2
Egress Traffic Flow