Solved: MGMT Interface on Nexus 7010

mohankumarm · ‎04-29-2013

Hi everybody,

We have a couple of Nexus 7010's split into Core and Distribution VDCs. MGMT0 interfaces on each of the Nexus VDC's (including the Admin VDC) are configured with different IP address, but on the same subnet i.e 10.10.10.1/24 for admin, 10.10.10.2/24 for Core and 10.10.10.3/24 for Distribution. The MGMT 0 physical port on each Nexus is connected to a physical gig port on a 3750 X switch, and the 3750X has uplinks back to the Nexus configured for vPC.

When i ssh to the VDC MGMT0 IPs from the 3750X, i can access each of these VDCs without any problems. But if i enable routing on each of these links(OSPF) and advertise it to the WAN, i cannot see these routes advertised and also cannot see any of these routes in the local routing table. Just wondering if i have to enable these links on a VLAN and then advertise it to the WAN..But if this the case, VLANs cannot be created on the Admin(default VDC).

Thanks and Regards,

Mohan

Reza Sharifi · ‎05-01-2013

Hi Mohan,

That is correct, We are bringing vlan 100 which is a management vlan and on the 7ks the mgmt0 ips are part of vrf management back to the 7k and put them in global routing table where they will be visible to the rest of the network.

Basically, we are connecting the management vrf to the global routing table through the 3750.

HTH

Reza

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Reza Sharifi · ‎05-03-2013

Hi Mohan,

You just need redundant layer-3 links (/30s) from the 3750 back to the Nexus, no need for layer-2. vPC, etc...

The management interfaces connecting to the 3750 are just host ports. So, you should be good to go with just the layer-3 links.

HTH

Reza

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Steve Fuller · ‎04-29-2013

Hi,

The mgmt0 interface is typically in the Management VRF and so the addresses will not be visible within the default VRF that's probably connected to your WAN. You can see the VRF these interfaces are associated with using the show ip interface brief vrf all command.

Regards

Reza Sharifi · ‎04-29-2013

As Steve said, the management interface is in a separate vrf and it is not visible to the regular routing table. Now, since all the mgmt interfaces connect to the 3750, if you could conne