Recently deployed an Arista switch. As L3 Routing was configured on this switch, it was not possible to set the OOB network as the default route.

To solve this problem, we created a VRF to isolate the OOB network.

Configuration Steps

First, we define a new VRF and rd

vrf definition OOB
   rd 10:1

Next, we configure the MGMT interface

interface Management1
   vrf forwarding OOB
   ip address

Set a static route and enable the routing feature of VRF

ip route vrf OOB
ip routing vrf OOB

Then, show ip route vrf OOB can be entered to view the configured routes

arista#show ip route vrf OOB

VRF name: OOB
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 - ISIS level 1, I L2 - ISIS level 2,
       O3 - OSPFv3, A B - BGP Aggregate, A O - OSPF Summary,
       NG - Nexthop Group Static Route, V - VXLAN Control Service

Gateway of last resort:
 S [1/0] via, Management1

 C is directly connected, Management1


Use ping vrf OOB ip to test connectivity

arista#ping vrf OOB ip 
PING ( 72(100) bytes of data.
80 bytes from icmp_seq=1 ttl=59 time=0.623 ms
80 bytes from icmp_seq=2 ttl=59 time=0.417 ms
80 bytes from icmp_seq=3 ttl=59 time=0.419 ms
80 bytes from icmp_seq=4 ttl=59 time=0.460 ms
80 bytes from icmp_seq=5 ttl=59 time=0.460 ms

--- ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4ms
rtt min/avg/max/mdev = 0.417/0.475/0.623/0.080 ms, ipg/ewma 1.004/0.548 ms