vlan question
Greenmet29
Member Posts: 240
in CCNA & CCENT
I'm having some trouble setting up vlans on my switches and I'm not 100% sure why... I have 3 2950 switches, with switch 1 being the vtp server and 2 & 3 being clients. When I bring vlan 2 up on switch 2 or 3, I get this message:
So basically, I bring vlan 2 up and it shuts vlan 1 down and then when I bring vlan 1 up it shuts down vlan 2. I'm confused
Switch2(config-if)#int vlan 1 Switch2(config-if)#no shut Switch2(config-if)# 02:16:29: %LINK-3-UPDOWN: Interface Vlan1, changed state to up Switch2(config-if)# 02:16:29: %LINK-5-CHANGED: Interface Vlan2, changed state to administratively down 02:16:30: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to up 02:16:30: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan2, changed state to down Switch2(config-if)#
So basically, I bring vlan 2 up and it shuts vlan 1 down and then when I bring vlan 1 up it shuts down vlan 2. I'm confused
Comments
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networker050184
Mod Posts: 11,962 Mod
I think your confusion comes from not knowing the difference between a VLAN and an SVI. You aren't actually shutting/no shutting the VLAN itself. On a 2950 you can only have one SVI up at a time. This is used only for management of the switch.An expert is a man who has made all the mistakes which can be made. -
Greenmet29
Member Posts: 240
Do you know why on switch one the vlan would show act/lshut?
Switch1#show vlan br VLAN Name Status Ports ---- -------------------------------- --------- ------------------------------- 1 default active Fa0/1, Fa0/2, Fa0/3, Fa0/4 Fa0/5, Fa0/6, Fa0/7, Fa0/8 Fa0/9, Fa0/10, Fa0/12, Fa0/13 Fa0/14, Fa0/15, Fa0/16, Fa0/17 Fa0/18, Fa0/19, Fa0/20, Fa0/21 Fa0/22, Fa0/24, Gi0/1, Gi0/2 2 L-vlan act/lshut Fa0/11 3 VLAN0003 active 4 K-vlan active 1002 fddi-default act/unsup 1003 trcrf-default act/unsup 1004 fddinet-default act/unsup 1005 trbrf-default act/unsup
And the fa0/11 int on switch1 is orange, but when I put it back in vlan1 it goes green -
networker050184
Mod Posts: 11,962 Mod
That is if you shutdown the VLAN itself.
configure terminal vlan 2 shutdown
Which is different than shutting down an SVI.configure terminal interface vlan 2 shutdown
An expert is a man who has made all the mistakes which can be made. -
Greenmet29
Member Posts: 240
Ahhhhhhhhhhhh.... nice.. so I think I understand now. I got that before but now I guess I just got confused about it. I think it's because i'm just used to typing "int" before it. I have to remember that the actual vlan isn't an interface, but that you can have an interface a vlan, but only one per switch. This is in order to have telnet/ssh access to the switch, right?
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networker050184
Mod Posts: 11,962 Mod
Greenmet29 wrote: »Ahhhhhhhhhhhh.... nice.. so I think I understand now. I got that before but now I guess I just got confused about it. I think it's because i'm just used to typing "int" before it. I have to remember that the actual vlan isn't an interface, but that you can have an interface a vlan, but only one per switch. This is in order to have telnet/ssh access to the switch, right?
Correct. Unless the switch is L3 it can have multiple SVIs up for routing between them. Think of the SVIs as the subinterfaces if you were doing ROAS with an external router.An expert is a man who has made all the mistakes which can be made.