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New Member

Subinterface / vlan tagging

Silly question just excuse me please..

How do i create subinterface on gigabit port on 6500 swicth to tag a vlan ??

for ex : int g4/46.103 there is no subinterface command ..

9 REPLIES

Re: Subinterface / vlan tagging

say if you want to create sub-interface on Gi1/1 main interface of router, you can try to configure sub-interface like this under interface config mode else in case of L3 switch you can create Layer 3 SVIs.

int gi1/1.103

ip address x.x.x.x x.x.x.x

encap dot1q 103

this should create subinterface gi1/5.103

try this .. rate if it helps ...

New Member

Re: Subinterface / vlan tagging

Hi mate

I m aware of these commands.. have used before .. but to be specfic it dosnt work on 6500 .. wondering what i am missing ..

int gi1/1.103

ip address x.x.x.x x.x.x.x

encap dot1q 103

as Jon mentioned, made the port as switchport.. still the condition is same . do i need to check my ios ??

to Give more idea on my sceniro , i have few sites(L2 non cisco devices - already 3 vlan created) which are piggy backed to 6500

6500 <-------> no cisco device (l2)

the port whcih on non cisco device is trunk and on 6500 i want these commands

int g4/46.102

ip add

encp

int g4/46.103

ip add

encp

int g4/46.104

ip add

encp

Now my problem is i am not allowed to create vlan's on 6500 !!!!!

suppose if was allowed i would have created trunk between 6500 and non cisco and SVI's on 65k ....

any suggestion how do i achive ????

Re: Subinterface / vlan tagging

Hi

You cannot create a sub-interface in a switch . You can configure multiple L3 vlans and allow the vlans via the port .

Hope this helps

regards

vanesh k

Hall of Fame Super Blue

Re: Subinterface / vlan tagging

Hi Vanesh

I have just created a subinterface on one of our 6500 switches. Do you mean you can't create them or that they won't work even if you do.

By default all ports on 6500 are switchports so i had to do a "no switchport" on the interface first.

Regards

Jon

Re: Subinterface / vlan tagging

Hi Jon,

Thanx for mentioning the same . Iam very sorry for the earlier post . Pls ignore my earlier post.

regards

vanesh k

New Member

Re: Subinterface / vlan tagging

jon what ios ver you have on your 6500

heregoes mine

sh ver

Cisco Internetwork Operating System Software

IOS (tm) c6sup2_rp Software (c6sup2_rp-DSV-M), Version 12.1(23)E2, RELEASE SOFTWARE (fc1)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2004 by cisco Systems, Inc.

Compiled Fri 29-Oct-04 18:32 by yiyan

Image text-base: 0x40008F90, data-base: 0x41924000

ROM: System Bootstrap, Version 12.1(11r)E1, RELEASE SOFTWARE (fc1)

BOOTLDR: c6sup2_rp Software (c6sup2_rp-DSV-M), Version 12.1(23)E2, RELEASE SOFTWARE (fc1)

Balliol_6500 uptime is 6 weeks, 3 days, 1 hour, 11 minutes

Time since Balliol_6500 switched to active is 6 weeks, 3 days, 1 hour, 10 minutes

System returned to ROM by power-on (SP by power-on)

System image file is "disk0:c6sup22-dsv-mz.121-23.E2.bin"

cisco WS-C6506 (R7000) processor (revision 3.0) with 112640K/18432K bytes of memory.

Processor board ID SAL0812343N

R7000 CPU at 300Mhz, Implementation 39, Rev 3.3, 256KB L2, 1024KB L3 Cache

Last reset from power-on

Bridging software.

X.25 software, Version 3.0.0.

13 Virtual Ethernet/IEEE 802.3 interface(s)

58 Gigabit Ethernet/IEEE 802.3 interface(s)

381K bytes of non-volatile configuration memory.

32768K bytes of Flash internal SIMM (Sector size 512K).

Configuration register is 0x2102

Re: Subinterface / vlan tagging

Hello,

On Cat6500 you can create the sub-interfaces using the " int gig x/y.x" command in the global interface mode but you will not able to use the " encapsulation " command under it. This is the limitation on Cat6500.Its not supported on cat6500 and you can only either create L3 SVI's or layer ports on the 6500.

HTH,Please rate if it does.

-amit singh

Hall of Fame Super Blue

Re: Subinterface / vlan tagging

I think you can actually use subinterfaces on the Cat6500. Attached is a link to part of the IOS config doc for 6500 switches (12.2SX).

Basically you cannot use a vlan with the 1-1005 range on a subinterface if the switch is in vtp client or server mode. But you can use vlan numbers above that range. If the switch is in transparent mode then you can use any vlan number.

http://www.cisco.com/en/US/products/hw/switches/ps708/products_configuration_guide_chapter09186a0080160a07.html#wp1040486

Regards

Hall of Fame Super Blue

Re: Subinterface / vlan tagging

Although it looks like you can use subinterfaces and encapsulation with 12.2(SX) according to the docs for 12.1 the 6500 does not support subinterfaces - excerpt from doc:-

Catalyst 6500 series switches support Layer 3 trunks only on the 4-port Gigabit Ethernet WAN modulea (OSM-4GE-WAN and OSM-2+4GE-WAN+). You cannot configure subinterfaces or use the encapsulation keyword on LAN ports. Catalyst 6500 series switches support Layer 2 trunks and Layer 3 VLAN interfaces, which provide equivalent capabilities for LAN ports. See Chapter 7, "Configuring LAN Ports for Layer 2 Switching" and the "Configuring IP Routing and Addresses" section.

Full link

http://www.cisco.com/en/US/products/hw/switches/ps708/products_configuration_guide_chapter09186a008007e6df.html

HTH

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