fact that the static route has become self-recursive will be detected and it will be removed from the routing
table, although not from the configuration. A subsequent network change may cause the static route to no
longer be self-recursive, in which case it is re-inserted in the routing table.
Fully Specified Static Routes
In a fully specified static route, both the output interface and next hop are specified. This form of static route
is used when the output interface is multiaccess and it is necessary to explicitly identify the next hop. The
next hop must be directly attached to the specified output interface. The following example shows a definition
of a fully specified static route:
RP/0/RSP0/CPU0:router(config)# router static
RP/0/RSP0/CPU0:router(config-static)# address-family ipv6 unicast
RP/0/RSP0/CPU0:router(config-static-afi)# 2001:0DB8::/32 Gigethernet0/0/0/0 2001:0DB8:3000::1
A fully specified route is valid (that is, a candidate for insertion into the routing table) when the specified
interface, IPv4 or IPv6, is enabled and up.
Floating Static Routes
Floating static routes are static routes that are used to back up dynamic routes learned through configured
routing protocols. A floating static route is configured with a higher administrative distance than the dynamic
routing protocol it is backing up. As a result, the dynamic route learned through the routing protocol is always
preferred to the floating static route. If the dynamic route learned through the routing protocol is lost, the
floating static route is used in its place. The following example shows how to define a floating static route:
RP/0/RSP0/CPU0:router(config)# router static
RP/0/RSP0/CPU0:router(config-static)# address-family ipv6 unicast
RP/0/RSP0/CPU0:router(config-static-afi)# 2001:0DB8::/32 2001:0DB8:3000::1 210
Any of the three types of static routes can be used as a floating static route. A floating static route must be
configured with an administrative distance that is greater than the administrative distance of the dynamic
routing protocol because routes with smaller administrative distances are preferred.
By default, static routes have smaller administrative distances than dynamic routes, so static routes are
preferred to dynamic routes.
Note
Default VRF
A static route is always associated with a VPN routing and forwarding (VRF) instance. The VRF can be the
default VRF or a specified VRF. Specifying a VRF, using the vrf vrf-name command, allows you to enter
VRF configuration mode for a specific VRF where you can configure a static route. If a VRF is not specified,
a default VRF static route is configured.
IPv4 and IPv6 Static VRF Routes
An IPv4 or IPv6 static VRF route is the same as a static route configured for the default VRF. The IPv4 and
IPV6 address families are supported in each VRF.
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.1.x
556 OL-30423-03
Implementing Static Routes
Fully Specified Static Routes
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