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Cisco Nexus 7K ospf with 6500 VSS

Answered Question
Jan 2nd, 2014
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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.

Correct Answer by Reza Sharifi about 3 years 7 months ago

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

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Correct Answer
Reza Sharifi Thu, 01/02/2014 - 07:31
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    2017 LAN

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

Steven112 Fri, 05/16/2014 - 00:45
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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

aasaadsavola Mon, 09/19/2016 - 23:06
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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.

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