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Inter vlan routing


I'm using 6509 switch and created nearly 20 vlan's but all the vlan's are able to access each other. How do i block this without using access-list ?

Please help me is there any other option.Please find the show version of my switch.

Cisco Internetwork Operating System Software

IOS (tm) s72033_rp Software (s72033_rp-IPSERVICESK9_WAN-M), Version 12.2(18)SXF3, RELEASE SOFTWARE (fc1)

Technical Support:

Copyright (c) 1986-2006 by cisco Systems, Inc.

Compiled Tue 14-Feb-06 18:08 by kehsiao

Image text-base: 0x40101040, data-base: 0x42DA0000

ROM: System Bootstrap, Version 12.2(17r)S2, RELEASE SOFTWARE (fc1)

BOOTLDR: s72033_rp Software (s72033_rp-IPSERVICESK9_WAN-M), Version 12.2(18)SXF3, RELEASE SOFTWARE (fc1)

Campus-core-sw1 uptime is 40 weeks, 1 day, 1 hour, 5 minutes

Time since Campus-core-sw1 switched to active is 40 weeks, 1 day, 1 hour, 4 minutes

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

System restarted at 18:01:00 IST Sun Jul 9 2006

System image file is "disk0:s72033-ipservicesk9_wan-mz.122-18.SXF3.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

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cisco WS-C6509-E (R7000) processor (revision 1.2) with 458720K/65536K bytes of memory.

Processor board ID SMC1008007R

SR71000 CPU at 600Mhz, Implementation 0x504, Rev 1.2, 512KB L2 Cache

Last reset from power-on

SuperLAT software (copyright 1990 by Meridian Technology Corp).

X.25 software, Version 3.0.0.

Bridging software.

TN3270 Emulation software.

49 Virtual Ethernet/IEEE 802.3 interfaces

96 FastEthernet/IEEE 802.3 interfaces

36 Gigabit Ethernet/IEEE 802.3 interfaces

1917K bytes of non-volatile configuration memory.

8192K bytes of packet buffer memory.

65536K bytes of Flash internal SIMM (Sector size 512K).

Configuration register is 0x2102


Re: Inter vlan routing


disable ip routing on switch and disable rip/ospf etc on switch, configure switch as L2 Vlan

I hope this will help you out, please rate this post.


New Member

Re: Inter vlan routing


6500 is a multilayer switch and routing is enabled by default. You can use VLAN ACL's to restrict routing between vlans.

New Member

Re: Inter vlan routing


These vlan's are advertised in WAN. Will there be any effect in WAN advertisement.Please find the vlan configuration and help me how can i disable ip routing.

description " vlan37 @ Campus "

ip address

no ip redirects

ip route-cache flow

New Member

Re: Inter vlan routing

you have to use VLAN ACL's.

New Member

Re: Inter vlan routing


You can implement vrf-lite, in such way that no vlan can comunicate with each other, this is a great method and the traffic is totally isolated without needing vlan acl's or IP acls.

The configuration looks like this,

ip vrf vlan3

rd 1:3

ip vrf vlan4

rd 1:4

interface vlan 3

ip vrf forwarding vlan3

ip address x.x.x.x

interface vlan 4

ip vrf forwading vlan4

ip address x.x.x.x

This is the method that I use for isolating the voice vlan traffic from other vlans and It really looks more elegant.




Re: Inter vlan routing


Since you stated How do i block this without using access-list ?

You would have to use Private VLANs, the major downside to this is the switch must be in transparent mode.



Re: Inter vlan routing

If you want a base config let me know. I will say looking at the config will not make much sense unless you read the Cisco doc, so I recommend reading it.

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