对于交换机来讲，配置访问列表可以有效控制VLAN间的访问，实现内网之间的安全控制，本文以Cisco Catalyst6509为例，对访问列表的配置和应用做以说明。

Console> (enable) set ip permit enable
IP permit list enabled.
Console> (enable) set ip permit 172.16.0.0 255.255.0.0 telnet
172.16.0.0 with mask 255.255.0.0 added to telnet permit list.
Console> (enable) set ip permit 172.20.52.32 255.255.255.224 snmp
172.20.52.32 with mask 255.255.255.224 added to snmp permit list.
Console> (enable) set ip permit 172.20.52.3 all
172.20.52.3 added to IP permit list.
Console> (enable) show ip permit
Telnet permit list feature enabled.
Snmp permit list feature enabled.
Permit List Mask Access Type
---------------- ---------------- -------------
172.16.0.0 255.255.0.0 telnet
172.20.52.3 snmp telnet
172.20.52.32 255.255.255.224 snmp
Denied IP Address Last Accessed Time Type Telnet Count SNMP Count
----------------- ------------------ ------ ------------ ----------
172.100.101.104 01/20/97,07:45:20 SNMP 14 1430
172.187.206.222 01/21/97,14:23:05 Telnet 7 236
Console> (enable)
Console> (enable) set ip permit disable all
Console> (enable) clear ip permit 172.100.101.102
172.100.101.102 cleared from IP permit list.
Console> (enable) clear ip permit 172.160.161.0 255.255.192.0 snmp
172.160.128.0 with mask 255.255.192.0 cleared from snmp permit list.
Console> (enable) clear ip permit 172.100.101.102 telnet
172.100.101.102 cleared from telnet permit list.
Console> (enable) clear ip permit all
IP permit list cleared.
Console> (enable)

备注：

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