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New Member

InterVLAN routing on a 6500 using an external 4700

Hi all,

I have a 6509 with 4 VLANs defined and routed via the MSFC2 cards.

I need to create 2 new VLANs, but I should use an external 4700 to route between them.

The 6509 has CatOS 6.1(2), the 4700 has IOS 11.3(11b)T1 and only ethernet interfaces.

If I'm not wrong, the 6500 does'n support multi-VLAN and the 4700 ethernet interface doesn't support ISL nor 802.1q

Any idea?

Thanks in advance

8 REPLIES

Re: InterVLAN routing on a 6500 using an external 4700

Create a trunk port on the catalyst and connect the 4700 ethernet to it using a cat 5 straight cable.

Now 4700 ethernet is 10 mbps . So you might want to force the port setting on the trunk port to 10mbps (set port speed )

I guess your 4700 IOS doesnt support the isl/802.1q encapsulations. I have a 4700 with me, loaded with 12.2 (12) - this is latest you can get now, it doesnt support isl, but it does support 802.1q. So you might want to upgrade the IOS on the 4700.

Once this is done, you can configure subinterfaces on the 4700 ethernet.

int e0

no ip address

int e0.1

description vlan 1

encapsulation dot1q 1

ip add 172.16.1.1 255.255.255.0

int e0.2

description vlan 2

encapsulation dot1q 2

ip add 172.16.2.1 255.255.255.0

In summary,

1. upgrade ios on 4700

2. configure trunk port on catalayst 6500, which allows the required vlans on that trunk.

3. configure intervlan routing on 4700.

New Member

Re: InterVLAN routing on a 6500 using an external 4700

Thank you.

Yes, my 4700 doesn't support any encapsulation under ethernet subinterfaces.

I also found a "Routing between VLANs overview" where there is explicitly wrote "Cisco does not support IEEE 802.1Q encapsulation for Ethernet".

BTW, I suppose this feature were included in new software releases as in your router.

Just a question: what kind of feature set do you have? IP only or IP Plus?

Thanks again

Re: InterVLAN routing on a 6500 using an external 4700

I am running c4500-jk8s-mz.122-12.bin

j indicates enterprise version

k8 - encryption support

s - NAT, ISL, LANE, IBM, MMP, VPDN/L2F)

I havent tried with a IP only or IP plus software

New Member

Re: InterVLAN routing on a 6500 using an external 4700

Why not create 2 new vlans on the MSFC/6509 ?

New Member

Re: InterVLAN routing on a 6500 using an external 4700

Because, the 2 new VLANs are requested to carry voice traffic and the network administrator wants to receive this traffic on a separate ethernet of the WAN router.

Cisco Employee

Re: InterVLAN routing on a 6500 using an external 4700

Trunking on 10Mbps port might work in later IOS but it is NOT suppported by TAC. Is there any reason for not to use the more powerful MSFC2?

New Member

Re: InterVLAN routing on a 6500 using an external 4700

Yes, the 2 new VLANs are requested to carry voice traffic and the network administrator wants to receive this traffic on a separate ethernet of the WAN router.

New Member

Re: InterVLAN routing on a 6500 using an external 4700

How about three vlans , 2 for the voice and a 3rd between the second ethernet port on the 4700 and the 6509/msfc. Policy route traffic on the 6509/msfx so that the voice goes onto the wan via the second ethernet port of the 4700.

Regards

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