VLAN config on 1721 4 port sw

hollywoodnetworx · ‎11-12-2004

Hello, I have vlan1 on FA/1, and vlan2 on FA/3. vlan1 has the IP of 192.168.100.1/27 , vlan 2 is 192.168.100.33/27. I have a PC connected to FA/3 that can ping 100.33 but not over to 100.1 on vlan1.

Both ports are in trunking mode with dot1q encapsulation. Here are some shows ... Any ideas or help would be appreciated, I know I am just missing something simple here. Thanks!

router#sh int fa 1 tru

Port Mode Encapsulation Status Native vlan

Fa1 on 802.1q trunking 1

Port Vlans allowed on trunk

Fa1 1-1005

Port Vlans allowed and active in management domain

Fa1 1-2

Port Vlans in spanning tree forwarding state and not pruned

Fa1 1-2

router#sh int fa 3 tru

Port Mode Encapsulation Status Native vlan

Fa3 on 802.1q trunking 2

Port Vlans allowed on trunk

Fa3 1-1005

Port Vlans allowed and active in management domain

Fa3 1-2

Port Vlans in spanning tree forwarding state and not pruned

Fa3 1-2

#sh int fa 1 switchport

Name: Fa1

Switchport: Enabled

Administrative Mode: trunk

Operational Mode: trunk

Administrative Trunking Encapsulation: dot1q

Operational Trunking Encapsulation: dot1q

Negotiation of Trunking: Disabled

Access Mode VLAN: 0 ((Inactive))

Trunking Native Mode VLAN: 1 (default)

Trunking VLANs Enabled: ALL

Trunking VLANs Active: 1-2

Priority for untagged frames: 0

Override vlan tag priority: FALSE

Voice VLAN: none

Appliance trust: none

#sh int fa 3 switchport

Name: Fa3

Switchport: Enabled

Administrative Mode: trunk

Operational Mode: trunk

Administrative Trunking Encapsulation: dot1q

Operational Trunking Encapsulation: dot1q

Negotiation of Trunking: Disabled

Access Mode VLAN: 0 ((Inactive))

Trunking Native Mode VLAN: 2 (test_vlan)

Trunking VLANs Enabled: ALL

Trunking VLANs Active: 1-2

Priority for untagged frames: 0

Override vlan tag priority: FALSE

Voice VLAN: none

Appliance trust: none

sartellderbis · ‎11-12-2004

Are both vlans showing up and up in show ip int br? Can you source a ping on the switch from vlan 1 to vlan 2 and vice versa? Does the ip network show up as directly connected in a show ip route? I'm not sure why you are trunking to an end pc but the configuration will work because your native vlans are set appropriately to match the untagged packets sent by the pc.

hollywoodnetworx · ‎11-12-2004

Thanks for the response, Yes both vlans are up and up, Pings between the two are successful, and the interfaces are directly connected in sh ip route. I am only using a PC because I dont have another switch to use to test connectivity through the 1721 and across vlans...

#ping

Protocol [ip]:

Target IP address: 192.168.100.33

Repeat count [5]:

Datagram size [100]:

Timeout in seconds [2]:

Extended commands [n]: y

Source address or interface: 192.168.100.1

Type of service [0]:

Set DF bit in IP header? [no]:

Validate reply data? [no]:

Data pattern [0xABCD]:

Loose, Strict, Record, Timestamp, Verbose[none]:

Sweep range of sizes [n]:

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 192.168.100.33, timeout is 2 seconds:

Packet sent with a source address of 192.168.100.1

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms

C 192.168.100.0 is directly connected, Vlan1

C 192.168.100.32 is directly connected, Vlan2

hollywoodnetworx · ‎11-12-2004