topic Re: L2 trunk and subinterfaces to Cisco in General Topics

L2 trunk and subinterfaces to Cisco

rperkin — Thu, 19 Sep 2013 08:37:09 GMT

I am trying to configure a L2 trunk from a Cisco 3750 to a Palo 5020

I cannot find any info on how to configure the Palo, as the terminology is different to me.

As a side note we are also running two 5020's in an Active/Active configuration

I have tried configuring it but getting errors saying L2 interfaces not supported in HA active/active

I need to run OSPF to the Palo so have to have L3 interfaces

Can anyone provide any assistance.

If we can start with the Trunk and sub interfaces on the Palo and take it from there.

Thanks

Roger

Re: L2 trunk and subinterfaces to Cisco

UhMayYeah — Thu, 19 Sep 2013 09:28:21 GMT

Hello Roger,

Configure Layer3 sub-interfaces for physical interface that connects to the Trunk port as exhibited in the following documents

How to Create Tagged Sub-Interfaces

(section For PAN-OS 4.1)

You may also use following tech note for reference :

Securing Inter VLAN Traffic

Re: L2 trunk and subinterfaces to Cisco

rperkin — Thu, 19 Sep 2013 10:18:30 GMT

Thanks,

We are running 5 so the config is a bit different, I have configured the L3 subinterfaces.

However I want this to trunk to a Cisco switch and if you make e1/1 a L2 interface then you cannot make the sub-interfaces L3?

I just need to know:

How to make a port a trunk port

What do I configure the Cisco end as

Then create sub interfaces to be able to ping.

Thanks

Re: L2 trunk and subinterfaces to Cisco

UhMayYeah — Thu, 19 Sep 2013 10:36:34 GMT

You can configure eth1 as L2,create L2 sub-interfaces foe eth1 with tags needed and assign these to a VLAN.

An L3 vlan interface can then be created to terminate OSPF .

Ref :Layer 2 Networking

Re: L2 trunk and subinterfaces to Cisco

rperkin — Thu, 19 Sep 2013 11:19:30 GMT

OK I have managed to get it working now

L3 interface which is trunking to a Cisco 3750 and L3 subinterfaces which I can ping from the Cisco

Cisco 3750 Configuration

interface FastEthernet1/0/1

switchport trunk encapsulation dot1q

switchport mode trunk

end

SwitchTEST#sh int trunk

Port Mode Encapsulation Status Native vlan

Fa1/0/1 on 802.1q trunking 1

Thanks for the help

Is there any documentation about how the Palo's form a trunk?

I just set the Cisco to mode trunk and it works so assume that is the best thing to do?

Roger

Currently studying for my CCIE in R&S!

latest updates on my CCIE Blog - www.rogerperkin.co.uk/ccie

Re: L2 trunk and subinterfaces to Cisco

rmonvon — Thu, 19 Sep 2013 11:56:10 GMT

You said it is working? On the cisco it appears Fa1/0/1 is set to use vlan tag=1. While on the PA eth1/1.2 and eth1/1.4 are set to VLAN tags=2 and 4, respectively. There seems to be a mismatch.

The trunk on the PA is using 802.1q standard and the packets are marked with vlan tag just like the Cisco. Thanks.

Re: L2 trunk and subinterfaces to Cisco

rperkin — Thu, 19 Sep 2013 12:00:53 GMT

It is working!

The 1 on the Cisco output refers the the Native Vlan

The port is running as a trunk and any traffic that comes into the trunk that is not tagged will be put into Vlan 1

Roger

Re: L2 trunk and subinterfaces to Cisco

rmonvon — Thu, 19 Sep 2013 12:25:55 GMT

thanks for the confirmation.