Posted on March 30, 2018 1:46 pm
 |  Asked by Warren Granada
 |  3238 views
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 Good day All

I have a silly question here the management interface all that it is used for is to manage the switch remotely only correct? What is confusing me is that if ma1 is only used to managed the switch remotely is when I do a 

show ip route 

I see a static route pointing to the ma1 interface

SW-CHOF-AC4#sh ip route

Codes: C – connected, S – static, K – kernel, 

       O – OSPF, IA – OSPF inter area, E1 – OSPF external type 1,

       E2 – OSPF external type 2, N1 – OSPF NSSA external type 1,

       N2 – OSPF NSSA external type2, B I – iBGP, B E – eBGP,

       R – RIP, A – Aggregate

Gateway of last resort:

 S      0.0.0.0/0 is directly connected, Management1

 C      10.16.180.0/23 is directly connected, Management1

does this mean ma1 is being used more than just management?

Thank you all in advance!!

Warren

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Answered on March 30, 2018 2:58 pm

Hi Warren.

The management interface is a layer 3 host port which is used only for switch management. The switch cannot route packets between management ports and network (Ethernet interface) ports because they are in separate routing domains.

https://www.arista.com/en/um-eos/eos-10-4-interfaces

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Answered on March 30, 2018 5:22 pm

Hi Warren,

You are right on the use of management interface. How do you have your default route setup? It’s likely setup using Ma1 as the next-hop instead of a next-hop IP address like below:

ip route 0.0.0.0/0 Management1

If you point the next-hop to an IP address, you’ll no longer see 0.0.0.0/0 as ‘directly connected’. Example: 

ip route 0.0.0.0/0 10.92.64.1

Switch#show ip route 

 

Codes: C – connected, S – static, K – kernel, 

       O – OSPF, IA – OSPF inter area, E1 – OSPF external type 1,

       E2 – OSPF external type 2, N1 – OSPF NSSA external type 1,

       N2 – OSPF NSSA external type2, B I – iBGP, B E – eBGP,

       R – RIP, I L1 – IS-IS level 1, I L2 – IS-IS level 2,

       O3 – OSPFv3, A B – BGP Aggregate, A O – OSPF Summary,

       NG – Nexthop Group Static Route, V – VXLAN Control Service,

       DH – DHCP client installed default route, M – Martian

 

Gateway of last resort:

 S      0.0.0.0/0 [1/0] via 10.92.64.1, Management1

 

Cheers

Naveen

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