topic Re: OSPF for VOSS (VSP7200) to connect Cisco router? in ExtremeSwitching (VSP/Fabric Engine)

OSPF for VOSS (VSP7200) to connect Cisco router?

jwumcp — Wed, 13 May 2020 03:17:30 GMT

Dear all,

We are planning to deploy a VSP 7200 switch and this switch will be connected to a Cisco gateway router. This VSP switch will have multiple subnets/vlans and it will also be connected to multiple access level switches.

I literally have two questions.

This VSP has only default license on it. can it support OSPF?
if answer to Q1 is yes, can anyone provide some advice if there is anything I need to know before trying this? Especially I have never tried this between VSP and Cisco. I am relatively familiar with Cisco OSPF routing.

Thank you very much in advance.

Re: OSPF for VOSS (VSP7200) to connect Cisco router?

Dinesh_Rego — Wed, 13 May 2020 03:20:34 GMT

OSPF is part of the base software license which is included with the hardware purchase.

Re: OSPF for VOSS (VSP7200) to connect Cisco router?

EXTR_Paul — Wed, 13 May 2020 03:52:48 GMT

@Dinesh Regoanswered 1.

For #2, OSPF between VSPs and Cisco is something I have done countless times. It will work.

The only two questions I would have is A- are the VSPs running in Fabric/SPBm mode? Because that will require an ISIS-to-OSPF redistribution. B- is it just a point to point router interface between a single VSP and a single Cisco. Or is a cluster of VSPs and a cluster of Cisco switches?

Would you have a napkin diagram?

Here is a simple example of a VSP OSPF config.

https://extremeportal.force.com/ExtrArticleDetail?n=000023757&q=OSPF%20VOSS

Re: OSPF for VOSS (VSP7200) to connect Cisco router?

jwumcp — Wed, 13 May 2020 09:21:56 GMT

Thank you Paul for your quick response. I am not familiar with SPBm etc. It is just one single VSP connecting uplink to Cisco router. Pretty much point to point.

Re: OSPF for VOSS (VSP7200) to connect Cisco router?

EXTR_Paul — Wed, 13 May 2020 19:41:24 GMT

@jwumcp SPBm or Shortest Path Bridging is a protocol we use on VSPs to deploy campus Fabrics. If you have a VSP you should read up on it. It uses IS-IS as the control plane, if you are routing to OSPF, RIP, BGP you need to do a redistribution. But it doesn't apply to you today.

The link I showed you abobe will work 100%.

Here is a config example that will work for you as well.

vlan create 186 type port-mstprstp 0 ////// your routed vlan
vlan i-sid 186 186 /// (optional, as you aren’t running SPBm)

interface Vlan 186
ip address 172.18.6.3 255.255.255.248 //// So .1 or .2 would be your cisco routed interface
ip ospf enable //// The default is broadcast.

router ospf
as-bou en
router-id 172.16.40.5
exit
router ospf enable

Re: OSPF for VOSS (VSP7200) to connect Cisco router?

jwumcp — Thu, 14 May 2020 01:55:02 GMT

Thank you Paul for providing a simple example.

when I determine the area id, I assume it should use the same area id from the cisco router that it is connected to. However, how can I translate the area id from Cisco router into something like xx.xx.xx.xx? or I am totally wrong about this? the VSP is considered as a ASBR?

Re: OSPF for VOSS (VSP7200) to connect Cisco router?

EXTR_Paul — Thu, 14 May 2020 02:16:08 GMT

yes, match the area ID.

good chance its 0.0.0.0. so just replicate that on the VSP.