vlan interface down

[DonnaJ]

How do figure out why? I tryed no shut down, still down...

41-Switch-1#sh int vlan 3

Vlan3 is down, line protocol is down

Hardware is EtherSVI, address is 000a.f421.e800 (bia 000a.f421.e800)

Internet address is 10.7.41.210/24

MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

ARP type: ARPA, ARP Timeout 04:00:00

Last input never, output never, output hang never

Last clearing of "show interface" counters never

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

0 packets input, 0 bytes, 0 no buffer

Received 0 broadcasts (0 IP multicast)

0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

0 packets output, 0 bytes, 0 underruns

0 output errors, 1 interface resets

0 output buffer failures, 0 output buffers swapped out

[mahesh18]

Thanks for helping actually i was reading this part from book

There are no SVIs active on the MSFC-not even VLAN 1. Let's add an SVI for VLAN 20 and see what happens:

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MSFC-6509# conf t

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

MSFC-6509(config)# int vlan 20

MSFC-6509(config-if)# ip address 10.20.20.1 255.255.255.0

MSFC-6509(config-if)# no shut

MSFC-6509(config-if)# ^Z

MSFC-6509#

17w2d: %LINK-3-UPDOWN: Interface Vlan20, changed state to down

17w2d: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan20, changed state to down

MSFC-6509#

MSFC-6509# sho ip int brief

Interface IP-Address OK? Method Status Protocol

Vlan20 10.20.20.1 YES manual down down

The SVI is now there, but it won't come up. The SVI will not come up unless there is an active port in the VLAN in layer two. I often forget this fact and, after adding the SVIs, go off to create my VLANs only to find that none of them will come up. To illustrate the point, I'll assign an IP address to the CatOS management interface SC0, and place it in VLAN 20. This will put an active device in the VLAN:

CatOS-6509: (enable) set int sc0 20 10.20.20.20 255.255.255.0

Interface sc0 vlan set, IP address and netmask set.

Now, with something active in VLAN 20, the VLAN 20 SVI comes up in the MSFC:

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MSFC-6509# sho ip int brief

Interface IP-Address OK? Method Status Protocol

Vlan20 10.20.20.1 YES manual up up

Now i know that Sc0 management IP of Cat OS is assigned at switching side.and we can assign only 1 ip at switching side which is using CatOS right?

[Jon Marshall]

"Now i know that Sc0 management IP of Cat OS is assigned at switching side.and we can assign only 1 ip at switching side which is using CatOS right?"

Yes.

The other way to ensure that your vlan interfaces come up is if you have a L2 trunk to another switch and the vlan is allowed on this trunk. Then the interface would come up as well.

Jon

[mahesh18]

hi jon,

i have switch 6509 which on cat os side has

number of vlans with ip addresses???????????

so on cat os side is it ok to have no of vlans with ip addresses

[Richard Burts]

Mahesh

If it is truly a Catalyst 6509 and running CatOS on the switch side, then I do not believe that you can put multiple IP addresses on multiple VLANs. Perhaps you can post some details from the switch so that we can see what you are talking about.

The only way that I know to put multiple IP addresses on multiple VLANs is either to be on the MSFC rather than the switch or to be running IOS code rather than CatOS.

HTH

Rick

[mahesh18]

thanks rick for reply

actually those ips were vlan names

i am ok

thanks once again

[Richard Burts]

Mahesh

VLAN names makes much more sense. I am glad that you are ok.

HTH

Rick