InterSwitch Trunk (IST) is one or more parallel point-to-point links that connect two switches together to create a single logical switch. The IST allows the two switches to share addressing information, forwarding tables, and state information, permitting rapid (less than one second) fault detection and forwarding path modification. Edge switches, servers or PC's see the two aggregate switches as one large switch.

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  • InterSwitch Trunk (IST) is one or more parallel point-to-point links that connect two switches together to create a single logical switch. The IST allows the two switches to share addressing information, forwarding tables, and state information, permitting rapid (less than one second) fault detection and forwarding path modification. Edge switches, servers or PC's see the two aggregate switches as one large switch. This allows any vendor's equipment configured to use the IEEE 802.3ad static link aggregation protocol to connect to both switches and take advantage of load balancing, redundant connections. The IST protocol was developed by Nortel to enhance the capabilities of Link aggregation, and is required to be configured prior to configuring the SMLT, DSMLT or R-SMLT functions on the two aggregate (core, distribution, or access) switches. The edge equipment can be configured with any of the following; Multi-Link Trunking (MLT), DMLT, IEEE 802.3ad static link aggregation, IEEE 802.3ad Static Gigabit EtherChannel (GEC), IEEE 802.3ad Static Fast EtherChannel (FEC), SMLT, DSMLT, and other static link aggregation protocols.
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  • InterSwitch Trunk (IST) is one or more parallel point-to-point links that connect two switches together to create a single logical switch. The IST allows the two switches to share addressing information, forwarding tables, and state information, permitting rapid (less than one second) fault detection and forwarding path modification. Edge switches, servers or PC's see the two aggregate switches as one large switch.
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  • InterSwitch Trunk
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