10-21-2009 05:55 AM - edited 03-06-2019 08:13 AM
I am having trouble bringing up a second VLAN on a Catalyst 3750 running 12.2(25)SEE.
The first VLAN (101) is working fine. The second (102) is Down/down. Here are the config sections that I have scripted:
bbswitch0-live#sh run int Vlan101
Building configuration...
Current configuration : 186 bytes
!
interface Vlan101
ip address 85.205.15.246 255.255.255.252
ip access-group fromvodafone in
ip access-group tovodafone out
no ip redirects
no ip unreachables
no ip proxy-arp
end
bbswitch0-live#sh run int gi0/49
Building configuration...
Current configuration : 240 bytes
!
interface GigabitEthernet0/49
description P2p OneNet - FRA/DUS/LE-069137
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 101,102
switchport mode trunk
switchport nonegotiate
mls qos trust dscp
no cdp enable
end
bbswitch0-live#
bbswitch0-live#sh run int Vlan102
Building configuration...
Current configuration : 185 bytes
!
interface Vlan102
ip address 85.205.13.74 255.255.255.252
ip access-group fromvodafone in
ip access-group tovodafone out
no ip redirects
no ip unreachables
no ip proxy-arp
end
bbswitch0-live#sh int vlan101
Vlan101 is up, line protocol is up
Hardware is EtherSVI, address is 0013.c4d0.d041 (bia 0013.c4d0.d041)
Internet address is 85.205.15.246/30
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 00:00:03, output 00:00:03, 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
24626854 packets input, 2522968725 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
23162770 packets output, 2004417061 bytes, 0 underruns
0 output errors, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
bbswitch0-live#sh int vlan102
Vlan102 is down, line protocol is down
Hardware is EtherSVI, address is 0013.c4d0.d046 (bia 0013.c4d0.d046)
Internet address is 85.205.13.74/30
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, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
bbswitch0-live#
Any ideas? TIA.
Solved! Go to Solution.
10-21-2009 06:08 AM
Marvin
1. Yes vlan 102 is created. See my "sh int Vlan102" output in the original post.
thats the L3 vlan interface not the L2 vlan.
When you do a "sh vlan" do you see vlan 102. If not you need to create it at L2 ie.
3750(config) vlan 102 name
Jon
10-21-2009 05:57 AM
2 things to check
1) have you created vlan 102 at L2 ie.
3750(config)# vlan 102 name
2) Is the trunk link up. I appreciate that vlan 101 is up/up but is there perhaps another active port on the switch in vlan 101 that is bringing that interface up.
Jon
10-21-2009 06:05 AM
Thank you for your suggestions jon.
1. Yes vlan 102 is created. See my "sh int Vlan102" output in the original post.
2. vlan 101 is only defined on a trunk port - no access ports. Here is a snippet of "sh VLAN":
bbswitch0-live#sh vlan
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active
101 P2P Link VF One Net active
Neither VLAN 101 or 102 have any access ports - only trunking and only on port gi0/49 (config in the o.p.). They are being used for BGP peering with an external AS.
10-21-2009 06:08 AM
Marvin
1. Yes vlan 102 is created. See my "sh int Vlan102" output in the original post.
thats the L3 vlan interface not the L2 vlan.
When you do a "sh vlan" do you see vlan 102. If not you need to create it at L2 ie.
3750(config) vlan 102 name
Jon
10-21-2009 06:17 AM
That was it. So simple.
I'm thinking that stores the VLAN info in vlan.dat which is why I was failing to see the problem by examining the config, correct?
10-21-2009 06:19 AM
Marvin
"
That was it. So simple."
No problem, happened to me a couple of times in the past as well :-)
If your switch is in VTP server or VTP client mode then yes you won't see the vlan info in the running config. VTP transparent will have it in the running config.
Jon
10-21-2009 10:27 AM
Hi.
Show vlan brief is a good command to remember if you are unsure whether you've created the L2 VLAN - has helped me a couple of times.
HTH
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