Folks, there are many discussions on voice vlan configuration. Since we don't have an IP phone, it's hard to test it. I did the following lab and it works very interestingly. Why not try the following in your lab:
r1-1(e0/0)-----(f0/1)sw(f0/2)---------r1-2(f0/0) | (f0/3)----------r1-3(e0) cat3550 f0/2 configured with one access vlan 20 and one voice vlan 50 f0/1 access vlan 50 f0/3 access vlan 20 r1-2 configured with a native vlan 20 and a dot1q trunk vlan 50 (simulating ip phone) And ping r1-1 and r1-3 works from r1-2! This means that cat3550 treats the voice vlan in a very special way! If you configure the voice vlan port as a dot1q trunk port, you may need to block all vlans other than the native vlan and voice vlan. Otherwise all other vlan packets will be sent to the ip phone... =================================== cat3550 configuration: interface FastEthernet0/1 switchport access vlan 50 no ip address ! interface FastEthernet0/2 switchport access vlan 20 switchport voice vlan 50 no ip address duplex full speed 100 spanning-tree portfast ! interface FastEthernet0/3 switchport access vlan 20 no ip address ! ============= r1-1: interface Ethernet0/0 ip address 50.1.1.10 255.255.255.0 r1-2: interface FastEthernet0/0 no ip address speed 100 full-duplex ! interface FastEthernet0/0.20 encapsulation dot1Q 20 native ip address 20.1.1.1 255.255.255.0 ! interface FastEthernet0/0.50 encapsulation dot1Q 50 ip address 50.1.1.1 255.255.255.0 ! r1-3: interface Ethernet0 ip address 20.1.1.3 255.255.255.0 no ip directed-broadcast ! r1-2#p 20.1.1.3 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 20.1.1.3, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms r1-2#p 50.1.1.10 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 50.1.1.10, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms cat3550-11#sh int f0/2 swi Name: Fa0/2 Switchport: Enabled Administrative Mode: dynamic desirable Operational Mode: static access Administrative Trunking Encapsulation: negotiate Operational Trunking Encapsulation: native Negotiation of Trunking: On Access Mode VLAN: 20 (VLAN0020) Trunking Native Mode VLAN: 1 (default) Administrative private-vlan host-association: none Administrative private-vlan mapping: none Operational private-vlan: none Trunking VLANs Enabled: ALL Pruning VLANs Enabled: 2-1001 Protected: false Unknown unicast blocked: disabled Unknown multicast blocked: disabled Voice VLAN: 50 (VLAN0050) <--- wow, voice vlan now is active!!! Appliance trust: none Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=65022&t=65022 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]