Vlan issue with C2950 switch?

Question

hi

while i was configuring C2950 i came across the following issue

int vlan is made... and ip address is assigned.




int f0/23 and 24 is made trunk.

but when show vlan command was given , under vlan 1 there was no ports assigned. By default trunks should come under vlan 1 . The trunk encapsulation used was dot1Q.

due to this issue the uplink is not established and communication is not happening.

can anybody please say what would be the reason.



"" !
interface FastEthernet1/23
switchport mode trunk
no ip address
!
interface FastEthernet1/24
switchport mode trunk
no ip address
!
interface Vlan1
ip address 10.2.2.80 255.255.254.0
no ip route-cache
! ""


VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active
42 VLAN0042 active Fa1/0, Fa1/1, Fa1/2, Fa1/3
Fa1/4, Fa1/5, Fa1/6, Fa1/7
Fa1/8, Fa1/9, Fa1/10, Fa1/11
Fa1/12, Fa1/13,Fa1/14, Fa1/15
Fa1/16, Fa1/17, Fa1/18, Fa1/19
Fa1/20, Fa1/21,Fa1/22, Fa1/23, Fa1/24
1002 fddi-default act/unsup
1003 token-ring-default act/unsup
1004 fddinet-default act/unsup
1005 trnet-default act/unsup

VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
1 enet 100001 1500 - - - - - 1002 1003
42 enet 100042 1500 - - - - - 0 0
1002 fddi 101002 1500 - - - - - 1 1003
1003 tr 101003 1500 1005 0 - - srb 1 1002
1004 fdnet 101004 1500 - - 1 ibm - 0 0
1005 trnet 101005 1500 - - 1 ibm - 0 0
R1#



the port seems to be in vlan 42. but in the running config it is visible that the interface is made trunk.

Answer 1

so its a simple question .first thing is that you have not save your running configuration into nvram.save it by using command copy run start or by using WR in privilege mode of the switch .you have assigned perfectly your vlan as well as port assigning .

you also know that multiple ports can be assigned to a running vlan by using -int range fa0/1-24

switchport mode vlan

switchport trunk allowed vlan 40

exit

do with other vlans as here shown .

also be careful that which vlan you r trunking with your cisco router.you might know how to creat a sub interface in your routers fast ethernet port.

here is the url

(http://www.freeccnaworkbook.com/workbooks/ccna/configuring-inter-vlan-routing-router-on-a-stick)

if you don't know how to do this .

then here are my configurations for your router

R1>enable

R1#configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

R1(config)#interface fa0/0

R1(config-if)#no shut

R1(config-if)#interface fa0/0.20

R1(config-subif)#encapsulation dot1q 20

R1(config-subif)#ip add 10.1.20.1 255.255.255.0

R1(config-subif)#exit

R1(config)#

contact me/mail me on [e-mail] if any issues pursuits .

Answer 2

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Answer 3

Give this a shot:



switch(config)# int ra fa1/23-24

switch(config-if)# switchport trunk native vlan 1