08-27-2014 07:12 AM
One more question regarding OSPF configuration :
I am trying to figure out the configuratrion procedure based on below doc :
Which refers to below figure :
1. I would like to know if MLX routers need to have Ve 1001 created ?
2. In the last step it mentions "Assign VLAN 1001 to a vLAG". Is it referring the area indicated by green color ? What is the procedure of this step ?
Thanks in advance
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08-27-2014 02:55 PM
1. Yes, you would need to configure VE1001 on the MLXes. It looks like the MLX switches have MCT configured which is a multichassis LAG technology, so you would have to configure VLAN1001, create VE1001 and then configure that into the same subnet as the VDXes.
2. On the vLAG port-channel configuration on RB1 and RB2 you would allow VLAN1001 using "switchport trunk allowed vlan add 1001" on the ports facing the MLXes.
Personally, I think that using MCT and vLAG might be over complicating things. If you just need layer 3 connectivity between VDX and MLX layers then you could use point to point OSPF links between the two sets of devices. If you need to extend layer 2 between VDX and MLX then using MCT and vLAGs would be a reasonable approach which provides resilience but eliminates the need for spanning tree.
08-27-2014 03:19 PM
Thanks for the response and I almost got what I needed. Just one thing :
Could you please explain more about 'point to point OSPF links'.Is this another set of connection other than normal connection ?
08-27-2014 03:51 PM
If you have a layer 3 connection between two OSPF routers, it is called point-to-point network and you will not need a designated router (DR) or backup designated router (BDR) in this case. If you have a layer 2 switch or network connecting the OSPF routers, you don't have a point-to-point link and you will need DR/BDR in this case.