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New Member

Cisco Nexus 7K ospf with 6500 VSS

Hi,

I would like to check on the possible design setup for dynamic routing via ospf for the nexus switch. My setup is as below:

N7K -----------vpc --------- N7K

  |                                |

  |(L3 ospf)                    | (L3 ospf)

6500-----------vss---------6500

Besides having dedicated layer 3 interface/link aggregated (parallel routed ports) ospf between each nexus switch and each 6500 switch; I would like to check if it may be possible to create/have ospf between the N7K via the vpc/virtual peer link(without dedicated link between the N7K)? This is for redundancy in case one of the N7K uplink to the 6500 disconnects/removed such that the other nexus switch may route traffic successfully.

Any suggesstion is appreciated.

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VIP Super Bronze

Cisco Nexus 7K ospf with 6500 VSS

Hi,

A separate link is preffered, but you don't have to have a separate link for the layer-3 connection between the 7ks.  You can use an SVI and use the existing peer link to route between them using OSPF.

HTH

5 REPLIES
VIP Super Bronze

Cisco Nexus 7K ospf with 6500 VSS

Hi,

A separate link is preffered, but you don't have to have a separate link for the layer-3 connection between the 7ks.  You can use an SVI and use the existing peer link to route between them using OSPF.

HTH

New Member

Cisco Nexus 7K ospf with 6500 VSS

Hi Reza,

Thanks.

New Member

Hi Reza, 1. i have the same

 

Hi Reza,

 

1. do you have document mentioned if i add extra link better than using vPC peer-link.

2. i read if enable OSPF over VPC   peer-link and  configure peer-gateway, the OSPF will fail ? please correct me

 

 

Thanks

New Member

Golden Rule in VPC  :  any

Golden Rule in VPC  :  any traffic pass via VPC Peer-Link and send it out to VPC port , this traffic will be dropped.

so if you running OSPF between NKs and 6500  , there is possibility for traffic to pass via Peer link and send it out to VPC ports which cause dropping the traffic.

from your diagram:  Switch 6500 connect to NKs as normal ports  so these ports called Orphan ports and so the traffic coming form Orphan ports can pass the vpc peer link.

New Member

Hi,

Hi, I believe you may refer to http://www.cisco.com/c/dam/en/us/td/docs/switches/datacenter/sw/design/vpc_design/vpc_best_practices_design_guide.pdf on the vpc best practice design guide on page 84 which talks on backup routed path. There are afew options with preferred for dedicated and least preferred using VPC link using ospf. Hope it helps.
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