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Enthusiast

SDA: Edge node behind Edge node

Good morning 

 

Just a simple question about the physical design of a sd-access topology.

 

Is it supported that an Edge Node is attached to another Edge Node ?

 

Kind regards

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Cisco Employee

Re: SDA: Edge node behind Edge node

Yes, you can build a point-to-point routed link between FE1 and FE2, and have them in a chain, that is allowed. It is fine on 3650, 3850, 9300 and 9400 because on these platforms any switch port can be fabric facing. For 4500, having FEs in a chain is possibly a problem, since in 4500 we must have fabric facing ports on supervisor only, and it must be Supervisor 8-E or Supervisor 9-E. Best regards, Jerome

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Cisco Employee

Re: SDA: Edge node behind Edge node

Yes, you can build a point-to-point routed link between FE1 and FE2, and have them in a chain, that is allowed. It is fine on 3650, 3850, 9300 and 9400 because on these platforms any switch port can be fabric facing. For 4500, having FEs in a chain is possibly a problem, since in 4500 we must have fabric facing ports on supervisor only, and it must be Supervisor 8-E or Supervisor 9-E. Best regards, Jerome

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Beginner

Re: SDA: Edge node behind Edge node

You can build it but what about the optimization of such a solution. Whether in campus fabric (LISP/Geo-VXLAN) should not be built according to the rules appropriate for SPINE-LEAF EVPN. I mean the same length of routes/hops (between each two itr/etr) and predictable network behavior?

Cisco Employee

Re: SDA: Edge node behind Edge node

Good day ulasinski,

SDA solves campus LAN use cases. In campus LAN it's not always possible to have symmetrical physical network topology, the realities of large physical campus with optical paths between disparate areas means we might have multiple tiers of network infrastructure, asymmetry, and sometimes SDA fabric edges in chains. That said, I would not tell someone to go out of their way to try to build a daisy chain of FEs. If possible then build symmetry. If not possible then build what's necessary. Make sure there is sufficient bandwidth in underlay and let the underlay IGP take care of ECMP and convergence between FEs. In SDA architecture a chain of FEs works and it is supported. Symmetry may be more optimal, sure, but it won't be achievable in all real world campus network e.g. an airport where running kilometers of optical fibre under busy roads / runways is not an option.

Best regards, Jerome

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Beginner

Re: SDA: Edge node behind Edge node

Dear  Jerome

 

Would you please, confirm if the Cat 9500 support the chain FE.

 

( Cat 9300 as fabric Edge -to- Cat 9500 Fabric Edge) 

 

Best 

 

Imad 

 

 

Cisco Employee

Re: SDA: Edge node behind Edge node

Hello Imad,

Please refer to compatibility matrix for 9500 models and code versions supported as FE,

https://www.cisco.com/c/en/us/solutions/enterprise-networks/software-defined-access/compatibility-matrix.html

If the 9500 is supported as FE, then it will work as FE in daisy chain.

Regards, Jerome

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