Extreme Networks ExtremeWare XOS 11.3, Manual

Page: 400 / 698

Ethernet Automatic Protection Switching
ExtremeWare XOS 11.3 Concepts Guide
400
Multiple EAPS Domains
This section illustrates how you can work with more than one EAPS domain.
The scenarios described in this section include the following:
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EAPS Data VLAN Spanning Two Rings Connected by One Switch on page 400
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Multiple EAPS Domains per Ring—Spatial Reuse on page 401
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Multiple EAPS Rings Sharing a Common Link on page 402
EAPS Data VLAN Spanning Two Rings Connected by One Switch
Figure 20 shows how a data VLAN could span two rings interconnected by a common switch—a
“figure eight” topology. In this example, there is an EAPS domain with its own control VLAN running
on ring 1 and another EAPS domain with its own control VLAN running on ring 2. A data VLAN that
spans both rings will be added as a protected VLAN to both EAPS domains. Switch S5 has two
instances of EAPS domains running on it: one for each ring.
With this topology, switch S5 must have a core or an advanced core license to run two EAPS domains.
All other participating switches can have an advanced edge license.
Figure 20: EAPS data VLAN spanning two rings interconnected by one switch
EW_073
Master
node
Master
node
S 4
S 5
S 3
S 2
S 1
S
S
P
P
S 6
S 7
S 9
S 8
Ring 1 Ring 2