Port Trunking and Load Balancing in Blade Switches
Redundancy: What Happens When One Link in the Port Trunk Fails?
If a segment within the port trunk fails, traffic previously carried over the failed link switches to the remaining segments within the port trunk. Inbound broadcast and multicast packets on one segment in a port trunk are blocked from returning on any other segment of the port trunk.
802.1Q Tagging/Trunking Supported on Port Trunks
In a port trunk, member ports can be configured with or without IEEE 802.1Q trunking/tagging if they are members of a VLAN. After a port trunk is formed, configuring the primary/first port in that port trunk as tagged applies the configuration to all remaining ports in that port trunk. Similarly, configured trunk ports can be configured as a port trunk.
802.1Q encapsulation, if enabled, takes place independently of the source/destination load- balancing mechanism of a port trunk. The virtual LAN (VLAN) ID has no bearing on which link a packet takes. 802.1Q simply enables that trunk to belong to multiple VLANs. If trunking is not enabled, all ports associated with the port trunk must belong to the same VLAN.
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