Hello,
not a really new subject,
but I need some clarifications in my context : 2 Nexus 56128 (NX-OS 7.0.5) in a vPC domain ;
1) Routing (Static or OSPF) is supposed not to be supported between a router connected via 1 vPC Port-Channel to a pair of N5K : this is described here in CISCO vPC Fundamental Concepts :
http://www.cisco.com/c/en/us/products/collateral/switches/nexus-5000-series-switches/design_guide_c07-625857.html#_Toc271759466
2) in another hand, some docs or references tell or seem to the reverse, at least for OSPF :
a) http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/unicast/521_N11/cisco_n5k_layer3_ucast_cfg_rel_521_N1_1/l3_ospf.html#wp1468349 which states :
"A Cisco Nexus 5000 Series switch that is connected to a router and a vPC peer creates an OSPF association with the attached router but not with the vPC peer. This situation happens if a non-vPC VLAN is on a separate trunk between the vPC peers. If the non-vPC VLAN is on the vPC-peer link, then OSPF works for both vPC peers. This situation only happens when peer-gateway is enabled. "
By the way, this paragraph above has been removed in NX-OS 7.0 Config Guide
b) http://adamraffe.com/2013/03/08/l3-over-vpc-nexus-7000-vs-5000/ : see penultimate scenario
So, my questions are :
1) Is routing (static or OSPF) supported over a vPC between a router and a pair of vPC Nexus 56128 with NX-OS 7.0.5 ?
2) is OSPF routing supported over the vPC Peer-Link between both N56128 ?
3) is OSPF multicast frames supported over the vPC Peer-Link and over the vPC PO between the router and the 2 N56128 ?
4) if Multicast OSPF is the real problem/restriction over the vPC PO and/or vPC Peer-Link , can this problem be eliminated by using "ip ospf network point-to-point" on concerned SVI and/or interfaces ?
Optionnaly, I have described 4 possible scenarios to implement OSPF routing in my Nexus 56128 environment : see attached document "Nexus5K-OSPF-Scenarios-V2.0.pdf" :
5) Which ones are the supported scenarios ?
6) Which ones are the recommended scenarios ?
thanks in advance
