IP Router Configuration
Router Configuration Guide 17
• A loose mode uRPF check always succeeds.
• A strict mode uRPF check only succeeds if the SA matches any route (including the
default route) where the next-hop is on the incoming interface for the packet.
Otherwise the uRPF check fails.
If the source IP address matches a discard/blackhole route, the packet is treated as if it failed
uRPF check.
Creating an IP Address Range
An IP address range can be reserved for exclusive use for services by defining the
config>router>service-prefix command. When the service is configured, the IP address
must be in the range specified as a service prefix. If no service prefix command is configured,
then no limitation exists.
Addresses in the range of a service prefix can be allocated to a network port unless the
exclusive parameter is used. Then, the address range is exclusively reserved for services.
When defining a range that is a superset of a previously defined service prefix, the subset will
be replaced with the superset definition. For example, if a service prefix exists for 10.10.10.0/
24, and a new service prefix is configured as 10.10.0.0/16, then the old address (10.10.10.0/
24) will be replaced with the new address (10.10.0.0/16).
When defining a range that is a subset of a previously defined service prefix, the subset will
replace the existing superset, providing addresses used by services are not affected; for
example, if a service prefix exists for 10.10.0.0/16, and a new service prefix is configured as
10.10.10.0/24, then the 10.10.0.0/16 entry will be removed, provided that no services are
configured that use 10.10.x.x addresses other than 10.10.10.x.
QoS Policy Propagation Using BGP (QPPB)
This section discusses QPPB as it applies to VPRN, IES, and router interfaces. Refer to the
Internet Enhanced Service section in the Services Guide and the IP Router Configuration
section in the Router Configuration Guide.
QoS policy propagation using BGP (QPPB) is a feature that allows a route to be installed in
the routing table with a forwarding-class and priority so that packets matching the route can
receive the associated QoS. The forwarding-class and priority associated with a BGP route
are set using BGP import route policies. In the industry this feature is called QPPB, and even
though the feature name refers to BGP specifically. On SR routers, QPPB is supported for
BGP (IPv4, IPv6, VPN-IPv4, VPN-IPv6), RIP and static routes.
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