HP BladeSystem bc2800 Command Line Interface Reference Guide HP BladeSystem PC - Page 336
Description, Network Considerations
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Spanning-Tree Commands Example . 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. 22-40 www.hp.com HP PC Blade Switch CLI Reference Guide