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2-7

e1/0/15

Vlan

e1/0/1 S1

e1/0/10

S2989G-24TX Operation Manual Chapter 2 Layer 2 services

Configuration

Figure 2-2 Typical example of port isolation function

The topology and configuration of switches are showed in the figure above, with

e1/0/1, e1/0/10 and e1/0/15 all belonging to VLAN 100. The requirement is that, after port

isolation is enabled on switch S1, e1/0/1 and e1/0/10 on switch S1 can not communicate

with each other, while both of them can communicate with the uplink port e1/0/15. That is,

the communication between any pair of downlink ports is disabled while that between any

downlink port and a specified uplink port is normal. The uplink port can communicate with

any port normally.

The configuration of S1:

Switch(config)#isolate-port group test

Switch(config)#isolate-port group test switchport interface ethernet 1/0/1;1/0/10

2.3

Port Loopback Detection

2.3.1

Introduction to Port Loopback Detection

Function

With the development of switches, more and more users begin to access the network