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14 S

UMMIT

IRTUAL

HASSIS

ESIGN

AND

NSTALLATION

UIDE

UPPORTED

ONFIGURATIONS

OMBINING

IRTUAL

HASSIS

TACKS

A Virtual Chassis stack functions as a single entity. Multiple Virtual Chassis stacks can

be combined using traditional bridging and routing system design methods. For

example, when combining Virtual Chassis stacks, loops are not permitted unless they

use appropriate routing boundaries, or the Spanning Tree Protocol (STP).

Stacks can be combined in two ways. The first and most straightforward method uses

available Summit switch ports in each stack to interconnect the stacks. When using this

method, you must follow the same rules for connecting any Summit switch, including

load-sharing rules, port redundancy rules, and so on.

The second method uses a Summit switch that is a member of both Virtual Chassis

stacks. Using this method, you must adhere to the requirements of both stacks when

connecting the switch. For example, a single port is used for connecting to a single

Virtual Chassis stack; two ports are used for connecting to a parallel Virtual Chassis

stack that has two Summit Virtual Chassis. Figure 11 shows two single Virtual Chassis

stacks connected using a Summit1. The Summit1 is a member of both stacks.

Figure 11:

Combining Virtual Chassis stacks

Table 2 describes Summit switch support for the various Virtual Chassis stack

configurations. The parallel Virtual Chassis stack information is identical to the

load-sharing port configurations supported on Gigabit Ethernet ports for the Summit

switch family.

Stack 2Stack 1

virtchas.book Page 14 Friday, May 29, 1998 10:08 AM

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