topic Re: OSPF Voss to Cisco in ExtremeSwitching (VSP/Fabric Engine)

OSPF Voss to Cisco

BryceA — Tue, 10 Dec 2024 19:38:38 GMT

I am new to the Extreme world and as a jump in I have a network refresh of about 20 switches to do moving from Force 10/ Cisco to Extreme Voss. I have been having trouble figuring out how to configure OSPF on the new core switches. They will uplink to a cisco switch which handles the main OSPF routing between multiple branch locations. My test setup consists of a vist core pair with multiple edge switches. I have fabric working with l3vsn for the LAN. The core pair will also have a couple direct connections.
If I were doing the complete refresh in 1 swoop I believe I would just add the ospf config to each vlan per this guide.
How To: How To Configure OSPF | Extreme Portal

However this will not be a mass cutover and instead will first be a core walk over, and then each edge switch would be done at a different time (due to downtime scheduling and business production). So I will have a mix of cisco, force10, and voss all running at the edge.

In cisco I currently just have a summary route on the existing core. Is there a way to replicate this in Voss, or what would be the way to approach this? I have found lots of guides but due to my experience I believe I am not fully grasping what needs to happen. My last resort would be to just add a vlan to the cisco and move this OSPF config to the cisco switch but if possible, I would like to do everything in voss that we can.

This is the current ospf config on the core I am replacing.
router ospf 1441
network 192.168.100.0/24 area 0
network 172.17.0.0/16 area 1

Our local network consists of numerous /24 subnets with the 172.17.x.x IPs which is why in cisco the summary route works well.
Thank you for any help or guidance.

Re: OSPF Voss to Cisco

BryceA — Tue, 10 Dec 2024 21:02:43 GMT

I may have figured it out
router ospf
area 0.0.0.1
area range 0.0.0.1 172.17.0.0/16 summary-link advertise-mode summarize

I will add a cisco switch to my desk lab and see if that does it.

Re: OSPF Voss to Cisco

BryceA — Thu, 12 Dec 2024 19:41:45 GMT

I'm getting closer although I'm not sure if on the right path. I added the 172.17 summary route to my VRF and then created another summary route for the 192.168.100.0/24 network in the area 0.0.0.0. OSPF is enabled for the vrf and the switches can ping each other's IP on the 192 subnet (Voss when specifying the correct vrf for ping). I now have an adjacency formed but am not getting advertised routes on the Cisco. Voss is receiving the advertised routes from Cisco though.

I then backed out that summary route and added the config to the vlan as described in the above and no change happened for the routes. I can still see routes received form the Cisco but the cisco is not receiving routes from voss.

Re: OSPF Voss to Cisco

Phil_ — Fri, 13 Dec 2024 09:03:25 GMT

Hi Bryce,

there are multiple ways to solve your problem. If I understand correct you want the cisco Switch to learn IP networks configured on VOSS switch? The easiest way is to make a transfer network between the Cisco OSPF Router and the VOSS OSPF Router via an active ospf interface. After that you can enable OSPF as passive interface on the networks which you want the Cisco OSPF Router to be learned via the transfer network.

Example:
#active OSPF Network
vlan create 50 name transfer type port-mstprstp 0
vlan i-sid 50 50
interface vlan 50
ip address 10.50.50.1/24
ip ospf area 0.0.0.0
ip ospf network active
ip ospf enable
exit

#passive OSPF Network
vlan create 51 name RandomNetwork type port-mstprstp 0
vlan i-sid 51 51
interface vlan 51
ip address 10.51.51.1/24
ip ospf area 0.0.0.0
ip ospf network passive
ip ospf enable
exit

#after that you can enable ospf gloabaly
router ospf enable

Best regards,

Phil

Re: OSPF Voss to Cisco

BryceA — Thu, 02 Jan 2025 15:43:48 GMT

This was marked as a solution but was incorrect and did not work.