What is ubest/mbest?

Dear All,

The "show ip route" commad output is very different from IOS. I did not find any Cisco document that explains all the fields of this output.

What is ubest/mbest? I guess it is unicast best and multicast best, but why nexus is showing both unicast and multicast in the "show ip route" ?

Why there are many /32 routes marked as direct and local? What does direct and local mean in the output?

Any help/pointer is highly appreciated.

Another question...

When configuring routing protocol in VRF, what is the recommended way? 1 routing instance for multiple VRF or 1 routing instance per VRF? What are the pros and cons of each?

REgards,
mohannitinAsked:
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Don JohnstonInstructorCommented:
What is ubest/mbest?
Yes. It is the best unicast and best multicast route.  You should see that at the top of the output.

IIRC, something like:
* Best unicast route
** Best multicast route

but why nexus is showing both unicast and multicast in the "show ip route" ?
Because they are probably reusing the code that generates the display of the routing table rather writing a another routine.

Why there are many /32 routes marked as direct and local? What does direct and local mean in the output?
This is something Cisco started doing back around IOS 15 as well.  Basically they're showing what the local IP address is.  I don't know why they feel this is important to show in the routing table output but it's here in NX-OS as well.

When configuring routing protocol in VRF, what is the recommended way? 1 routing instance for multiple VRF or 1 routing instance per VRF? What are the pros and cons of each?
Each VRF should have it's own instance.  Otherwise it just gets confusing.
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mohannitinAuthor Commented:
thanks for your help
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mohannitinAuthor Commented:
how do you know so much ?
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Don JohnstonInstructorCommented:
I've been working in the networking field for over 25 years and I've been a Cisco instructor for about 15. :-)
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