Extreme Networks ExtremeWare XOS 11.1, Manual

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ESRP Examples
ExtremeWare XOS 11.1 Concepts Guide
351
Multiple Domains Using Layer 2 and Layer 3 Redundancy
The example shown in Figure 49 illustrates an ESRP configuration that has multiple domains using
Layer 2 and Layer 3 redundancy.
Figure 49: Multiple ESRP domains using Layer 2 and Layer 3 redundancy
This example builds on the previous example. It has the following features:
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An additional VLAN, Engineering , is added that uses Layer 2 redundancy.
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The VLAN Sales uses three active links to each BlackDiamond 10808 switch.
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The VLAN Engineering has two active links to each BlackDiamond 10808 switch.
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One of the edge devices carries traffic for both VLANs.
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The link between the third edge device and the first BlackDiamond 10808 switch uses 802.1Q tagging
to carry traffic from both VLANs traffic on one link. The BlackDiamond switch counts the link active
for each VLAN.
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The second BlackDiamond switch has a separate physical port for each VLAN connected to the third
edge switch.
In this example, the BlackDiamond switches are configured for ESRP such that the VLAN Sales
normally uses the first BlackDiamond switch and the VLAN Engineering normally uses the second
BlackDiamond switch. This is accomplished by manipulating the ESRP priority setting for each VLAN
for the particular BlackDiamond switch.
EX_098
Sales master,
Engineering standby
Sales
Sales standby,
Engineering master
Sales
VLAN Sales, ESRP domain esrp1 - untagged link
Sales +
Engineering
Engineering
VLAN Engineering, ESRP domain esrp2 - untagged link
VLANs Sales + Engineering, shared between ESRP domains
esrp1 + esrp2 - tagged link
OSPF
or RIP