Flat Network With Per-Vlan Spanning Tree - HP Bc1500 - BladeSystem - Blade PC Supplementary Manual

Network considerations guide

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Reference manual (432 pages)

User manual (216 pages)

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Table of Contents

This reference design illustrates how you can configure two or more physical connections to redundantly

deploy the HP PC Blade Switch. IEEE 802.1q VLAN tagging is in use so that while link E is blocked, link

D will carry traffic for both VLANs. If either link A & C or D were to fail, link E would take over.

This design's logic works the same for either IEEE 802.1D or 802.1w. The difference is that 802.1w

reconvergence is much faster and is the preferred choice for these two protocols.

Network Considerations

•

When configuring the HP PC Blade Switch for IEEE 802.1D or 802.1w operation, disable the PVST

Interop feature before changing the spanning tree mode to either STP or RSTP (see

spanning tree PVST Interoperability mode" on page

•

Optionally, you can use IEEE 802.3ad Link Aggregation in various combinations with this example

topology to enhance performance and link level redundancy.

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To maintain optimum network performance after a network failover, consider creating two LAGs, one

with ports e43 & e44, the other with ports e45 & e46.

•

Since most well designed networks rarely fail, a disaster recovery scheme could comprise a LAG

made up of ports e43 - 46 with port e42 functioning as the failover link. If the primary network path

did fail, network connectivity would continue over port e42 (100mbps), and then continue to operate

with degraded performance until the primary connection is restored. The LAG can be comprised of

two to four uplinks in any order. Port e42 can never be a member of a LAG.