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Cisco Router 802.1q Interoperability with HP Procurve 2512

Patrick Hurley_2
Occasional Contributor

Cisco Router 802.1q Interoperability with HP Procurve 2512

I have an HP Procurve that is connected to a Cisco 3725. I have the encapsulation set up properly for dot1q between the two. I have all the devices in vlan 1, the switch, the router, a PC and a Microwave radio.

If I try to ping the router interface from the PC I get no response but when I do a show arp on the router the mac address and IP address mapping shows up for the PC.

If I put the PC in VLAN 3, which of course is configured as a subinterface on the router and ping the VLAN 1 router IP address, it works.

What am I doing wrong here?
2 REPLIES
Arnaud_9
Valued Contributor

Re: Cisco Router 802.1q Interoperability with HP Procurve 2512

This look like a native VLAN Problem : Is your VLAN ID 1 tagged on the 2524 ?
If it is, you should try a configuration like the following (It work fine on a Cisco 2600XM connected with a HP2524)

On Cisco Routers -and other products-, there is a "Native" VLAN concept enabled by default on the VLAN ID 1, which will not be tagged for normal operations. This Native ID must be changed to use the VLAN 1 as tagged on a port.

interface FastEthernet0/0
no ip address

interface FastEthernet0/0.1
description -VLAN 1 Int-
encapsulation dot1Q 1
ip address 10.1.1.1 255.255.255.0
interface FastEthernet0/0.2
description -VLAN 2 Int-
encapsulation dot1Q 2
ip address 10.1.2.1 255.255.255.0
interface FastEthernet0/0.3
description -VLAN 3 Int -
encapsulation dot1Q 3
ip address 10.1.3.1 255.255.255.0
...
interface FastEthernet0/0.1000
description -Native VLAN ID1000 supposed not used-
encapsulation dot1Q 1000 native


For more informations, look at :
http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_configuration_guide_chapter09186a00800ca804.html
Arimo Laine_2
Valued Contributor

Re: Cisco Router 802.1q Interoperability with HP Procurve 2512

Hi.

Starting from the basics... are the IP addresses on VLAN 1 on the same addres range on both switches?

Arimo