Cisco Routing – Permanent Static Default Route Not Adding

ciscorouting

I am trying to add a static default route using the permanent keyword on an interface which is currently down/down. My understanding is that permanent keyword is supposed to bypass this check is that correct?

Router(config)#ip route 0.0.0.0 0.0.0.0 gigabitEthernet 0 permanent

%Default route without gateway, if not a point-to-point interface, may impact performance

Router(config)#do show ip route

Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override

Gateway of last resort is not set

Why does it not set the gateway of last resort?

EDIT

So I just noticed towards the end of my configuration it says:

!
!
ip route 0.0.0.0 0.0.0.0 X.X.X.X permanent

Even though show ip route says it's not set.

I saved running to startup, reloaded and sure enough:

Router#show ip route

Gateway of last resort is X.X.X.X to network 0.0.0.0

S*    0.0.0.0/0 [1/0] via X.X.X.X

This also works for interfaces

Gateway of last resort is 0.0.0.0 to network 0.0.0.0


S*    0.0.0.0/0 is directly connected, GigabitEthernet0

Best Answer

You did not use "ip route" right. You cannot do "ip route something interface", if this interface is ethernet (Full, Giga, Ten - whatever), because ethernet is broadcast interface, so router cannot create route and install it to RIB.

You can use "ip route something interface" without definition of destination ip only for p2p interfaces - Serial (with p2p type), PPPoE, etc...

Also "permanent" has sense only in "ip route something gw_ip"

The best description of right usage of "permanent" route you can find there - https://supportforums.cisco.com/discussion/10003171/static-route-permanent

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