Cisco 2811 VLAN Usage
Cisco 2811 configuration, Cisco VLAN, Cisco router configuration, Fast Ethernet, VLAN configuration, VLAN, Cisco Routers, Routers
I inherited a network that has a Cisco 2811 router setup with the following:
interface FastEthernet0/0
no ip address
no ip route-cache cef
no ip route-cache
duplex full
speed 100
!
interface FastEthernet0/0.18
description Data VLAN
encapsulation dot1Q 18 native
ip address 10.221.18.1 255.255.255.0
ip flow ingress
ip flow egress
no ip route-cache
!
interface FastEthernet0/0.255
description Voice VLAN
encapsulation dot1Q 255
ip address 10.255.255.1 255.255.255.0
no ip route-cache
no keepalive
I need some help understanding what Cisco has done here. I belive that interface FastEthernet0/0 has been setup as an IEEE802.1Q trunk port. The VLANS on this interface are VLAN 18 with interface 10.221.18.1 and VLAN 255 with interface 10.255.255.1. My questions is: Do I have to send packets to interface FastEthernet0/0 tagged? The switch that was connected to this interface had no configuration to it. I replaced that switch and things have stopped working. If I create VLAN 18 and VLAN 255 on my switch and assign ports to the VLANS, I assume this will correct my problems.
Is my understanding correct?
interface FastEthernet0/0
no ip address
no ip route-cache cef
no ip route-cache
duplex full
speed 100
!
interface FastEthernet0/0.18
description Data VLAN
encapsulation dot1Q 18 native
ip address 10.221.18.1 255.255.255.0
ip flow ingress
ip flow egress
no ip route-cache
!
interface FastEthernet0/0.255
description Voice VLAN
encapsulation dot1Q 255
ip address 10.255.255.1 255.255.255.0
no ip route-cache
no keepalive
I need some help understanding what Cisco has done here. I belive that interface FastEthernet0/0 has been setup as an IEEE802.1Q trunk port. The VLANS on this interface are VLAN 18 with interface 10.221.18.1 and VLAN 255 with interface 10.255.255.1. My questions is: Do I have to send packets to interface FastEthernet0/0 tagged? The switch that was connected to this interface had no configuration to it. I replaced that switch and things have stopped working. If I create VLAN 18 and VLAN 255 on my switch and assign ports to the VLANS, I assume this will correct my problems.
Is my understanding correct?
ASKED:
Mar 22, 2009 2:10 AM GMT
UPDATED:
June 12, 2009 12:22:20 PM GMT
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Answer Wiki:
You do one thing, plz replace the encapsulation from dot1q to isl, then it would work properly. There are very rare chances to configure isl in place of dot1q encapsulation. So please put this following command :
encapsulation isl 18
encapsulation isl 255
in place of encapsulation dot1q 18 native & encapsulation dot1q 255.
Thanks & Regards,
Bhupendra Singh
+91 9650234666
encapsulation isl 18
encapsulation isl 255
in place of encapsulation dot1q 18 native & encapsulation dot1q 255.
Thanks & Regards,
Bhupendra Singh
+91 9650234666
190 pts.
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