Cisco 871 and C2960 routing between vlans.

Answered Question

I have an 871 wireless router (c870-advipservicesk9-m version 15.1) and the c2960 switch (c2960-lanbasek9-m version 12.2). I was wondering if i can use the 871 to route between vlans on the c2960. I need to have 7 vlans setup on the network but the 871 only supports 4 vlans in its database. I know I can create more than 4 vlans on c2960's database but I don't how or if it's even possible to route between those vlans using the 871.

I have this problem too.
0 votes
Correct Answer by Leo Laohoo about 6 years 3 weeks ago

Hi Lei,

Just tried IOS versions 12.4(15)XY5, 12.4(11)XW10, and 12.4(4)XC7 and all three 12.4 will support 2 VLANs.

It looks like only 12.3 will support 10 VLANs.  Too bad.

Correct Answer by Nagaraja Thanthry about 6 years 3 weeks ago

Hello Lei,

871 supports 10 Wireless VLANs (10 BVI interfaces) but it has limitation of

4 VLANs (Ethernet based vlan).


The router will not accept the configuration of 5th VLAN.



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Overall Rating: 5 (8 ratings)
Reza Sharifi Sat, 09/04/2010 - 14:50

According to the datasheet, 871 supports OSPF, BGP and EIGRP.  I don't see why you can't route between 4 vlans using sub-interfaces with 802.1q trunk.



Reza Sharifi Sat, 09/04/2010 - 15:08

Well, the limitation on the router is only 4 vlans, so even though you set up 7 on the switch the router does not support more than 4.

what happens when you try to creat the 5 vlan on the router?  are you using 1 port with 802.1q and sub-interfaces?

Leo Laohoo Sun, 09/05/2010 - 15:19

I hate to be the person to deliver bad news but 870 ISR will only support TWO (2) VLANs and VLAN 1, the default, is already one of them.

Lei Tian Sun, 09/05/2010 - 16:09


You can downgrade your code. Tried 12.3(8)-YI2, it supports max 10 Vlans. Not sure the 4 Vlan limitation starts from which release, but I guess 12.4 none T release should support 10 Vlans as well.

Check the supported features before you change the code.


Lei Tian

Lei Tian Sun, 09/05/2010 - 16:45

Hi NT,

I understand the limitation. I think that was added in 12.4T train. It supports max 10 Vlans before 12.4T.


Lei Tian

Nagaraja Thanthry Sun, 09/05/2010 - 17:45

Hello Lei,

Have you personally configured 10 VLANs on this hardware? I tried on couple

of devices but after 4 vlans, it gave error message. If you have actually

tested it, can you please post the corresponding outputs here? Also, what

version/feature set you are running?



Leo Laohoo Sun, 09/05/2010 - 17:27

Support for 2 VLANs with Base Image. One VLAN dedicated to DMZ.

Lei Tian Sun, 09/05/2010 - 17:46

For the record, I tested on my 871. Here is the output.

R2#sh ver
Cisco IOS Software, C870 Software (C870-ADVIPSERVICESK9-M), Version 12.3(8)YI2, RELEASE SOFTWARE (fc1)
Synched to technology version 12.3(10.3)T2
Technical Support:
Copyright (c) 1986-2005 by Cisco Systems, Inc.
Compiled Tue 14-Jun-05 18:58 by ealyon

ROM: System Bootstrap, Version 12.3(8r)YI4, RELEASE SOFTWARE
ROM: Cisco IOS Software, C870 Software (C870-ADVIPSERVICESK9-M), Version 12.3(8)YI2, RELEASE SOFTWARE (fc1)

R2 uptime is 1 minute
System returned to ROM by power-on
System image file is "flash:c870-advipservicesk9-mz.123-8.YI2.bin"

This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:

If you require further assistance please contact us by sending email to
[email protected].

Cisco 871W (MPC8272) processor (revision 0x200) with 118784K/12288K bytes of memory.
Processor board ID FCZ114561YX
MPC8272 CPU Rev: Part Number 0xC, Mask Number 0x10
5 FastEthernet interfaces
1 802.11 Radio
128K bytes of non-volatile configuration memory.
24576K bytes of processor board System flash (Intel Strataflash)

Configuration register is 0x2102

R2#sh int trunk

Port      Mode         Encapsulation  Status        Native vlan
Fa0       on           802.1q         trunking      1

Port      Vlans allowed on trunk
Fa0       1-1005

Port      Vlans allowed and active in management domain
Fa0       1,10,20,30,40,50,60,70,80,90

Port      Vlans in spanning tree forwarding state and not pruned
Fa0       1,10,20,30,40,50,60,70,80,90
R2#sh ip int b | ex un
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet4         YES NVRAM  up                    down   
Vlan1                  YES NVRAM  up                    up     
Vlan10                  YES NVRAM  up                    up     
Vlan20                 YES NVRAM  up                    up     
Vlan30                 YES NVRAM  up                    up     
Vlan40                 YES NVRAM  up                    up     
Vlan50                 YES NVRAM  up                    up     
Vlan60                 YES NVRAM  up                    up     
Vlan70                 YES NVRAM  up                    up     
Vlan80                 YES NVRAM  up                    up     
Vlan90                 YES NVRAM  up                    up


Lei Tian

Leo Laohoo Sun, 09/05/2010 - 18:14

Nice one Lei (+5) here too.

This is one of those "murky" ones.

Let me get this straight, if you use, say 12.4 can you get 10 VLAN support?   What I meant to ask is, is the "T" train causing the number of VLANs supported to be lowered?   ANd if I use, for example, 12.2(24), I can get 10 VLANs?

Lei Tian Sun, 09/05/2010 - 18:21

Thanks for the rating

Definitely not in 12.4T; I think might be support for 12.4.

Correct Answer
Leo Laohoo Sun, 09/05/2010 - 19:49

Hi Lei,

Just tried IOS versions 12.4(15)XY5, 12.4(11)XW10, and 12.4(4)XC7 and all three 12.4 will support 2 VLANs.

It looks like only 12.3 will support 10 VLANs.  Too bad.


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