ASR or Nexus 7700 as an Edge Routing Device

Manuel used Ask the Experts™

   I wanted to get some opinion on what device would be better suited to be deployed at the edge of a site between an ASR or Nexus 7700? Specifically this device will be connecting to about 650 remote sites primarily doing routing. From a performance, and port capacity perspective what would be the best device to deploy?  Thank you
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The ASR series are routers, the Nexus 770 is a L3 switch with a feature set more towards the datacenter than the WAN.

I would suggest looking at the required features rather than playing "top trumps"
Top Expert 2011

How do you plan to connect to these remote sites. If by IPSEC VPN, ASR is your only choice. If by ethernet circuits/MPLS,etc. 7K would be a decent choice. As Arne stated, 7K is geared towards datacenter. If this isn't your scenario I'd go the ASR route.
atlas_shudderedSr. Network Engineer

I'll go the step farther and say that:

1. if you aren't connecting these sites back to this core site via 650 individual dedicated point to point circuits or;
2. if you don't intend to extend layer 2 connectivity inter-site for datacenter level connectivity and have need of Nexus OTV

Then trash the idea of the Nexus 7K outright and go with the ASR.  At the very least, dropping in the Nexus is a misapplication of funding and will ultimately work to add unnecessary complexity and management/administrative overhead for no net gain.


Hello all,

  Thank you for your responses. These 650 sites will be connected via private dedicated dark fiber point to point links back to central core site. At each remote site there will be a Cisco 3850 layer 3 switch not a router. This is why I was leaning towards the Nexus 7k. Also from a cost perspective I believe to get the same number of ports on the ASR as the Nexus 7K it would be more expensive. Please let me know your thoughts.
atlas_shudderedSr. Network Engineer

Like I noted above, if you need the port density because of point to points, then the 7K starts to make sense.  You'll need the 7718 to get the port density to support 650 individual point to points.  Might get resource intensive.  May be better to consider going to a series of smaller chassis in the 7k or 9k models with a higher total device count.

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