3Com corebuilder 3500 Implementation Manual page 188

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188
C
9: V
HAPTER
IRTUAL
VID 12, IP-1 VLAN
(Ports 1, 13-15)
VID 13, IP-2 VLAN
LAN
S
The system imposes two important limits regarding the number of VLANs
and the number of protocols:
Number of VLANs supported on the system — To determine the
minimum number of VLANs that the system can support, use the
equation described in "Number of VLANs" earlier in this chapter. The
system supports a maximum of 64 VLANs.
Maximum number of protocols — Use the value 15 as the
maximum number of protocols that can be implemented on the
system. A protocol suite that is used in more than one VLAN is
counted only once toward the maximum number of protocols. For
example, the DECnet protocol suite uses 5 of the available
15 protocols, regardless of the number of VLANs that use DECnet.
Example: Protocol-based VLANs for Bridging
Figure 31 is an example of a VLAN bridging configuration that contains
three protocol-based VLANs (two IP and one IPX) that overlap on an FDDI
link (port 1 in each VLAN). (You can configure the link to be part of a
trunk, as described in Chapter 8.) The end stations and servers are on
100Mbps ports, with traffic segregated by protocol. They are aggregated
over the FDDI link.
Figure 31 Example of a Bridging Protocol-based VLAN Configuration
VID 16, IPX-1 VLAN
(Ports 1, 7-9)
(Ports 1, 16-18)
FDDI
IP-1
IP-2
IPX-1
IP-1 Server
IPX-1 Server
IP-2 Server

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