Catalyst 4500-X Fixed 10 GE Aggregation Switch
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If the entire VSL bundle should fail, the Virtual <strong>Switch</strong>ing System Domain will enter a “Dual-Active” condition<br />
where both switches transition to Active state and share the same network configuration (IP addresses, MAC<br />
address, Router IDs, etc…) causing communication problems through the network…<br />
3 Step Process in Dual-Active Detection and Recovery:<br />
1<br />
Dual-Active detection uses PAgP to sends new Active<br />
switch ID in PAgP TLV field.<br />
VSS pair<br />
2<br />
Further network disruption is avoided by error-disabling<br />
previous VSS active switch interfaces connected to<br />
neighboring devices .<br />
Si<br />
Si<br />
3<br />
Dual-Active recovery, when VSL recovers, the switch that<br />
error-disabled its non-VSL interfaces in the previous step<br />
will reload to boot in standby state, re-enabling errordisabled<br />
ports<br />
© 2011 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 60
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