Command Line Interface Reference Guide HP BladeSystem PC Blade Switch

22-40 www.hp.com HP PC Blade Switch CLI Reference Guide
Spanning-Tree Commands
Example
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Description
n VLAN 1 assigned to all odd ports e1 - e39, e45 & e46.
n VLAN 2 assigned to all even ports e2 - e40, e43 & e44.
This reference design illustrates how four uplinks can connect the HP PC Blade Switch to two
separate aggregation switches forming a fully redundant network. If either link A & C or D
were to fail, link E would take over. HP recommends starting with this example for Cisco
networks using PVST/PVST+ where you want switch-based redundancy. If either link A & C
or D were to fail, link E and G would take over.
Network Considerations
n You can deploy the HP PC Blade Switch into this scenario without making changes to the
default configuration.
n For Cisco networks running PVST/PVST+, links A, B, and C may use either 802.1q or
ISL.encapsulation.
n In this scenario 802.1q (Virtual Bridged VLAN) can be used on links D, E, F, or G.
n You can achieve VLAN Load Balancing by reversing the links at the aggregation layer for
links E and F. Optimal load balancing may depend upon the configuration of the rest of
the network, and further optimization may require addition configuration.
n For large deployments, 802.1w may be a better option because the same type of
redundancy can be achieved with two instead of four uplinks.