Configuring The Mtu; Configuring Static Routes - Motorola BSR 2000 Configuration And Management Manual

Release 1.0

Configuring the MTU

Fragmentation occurs when an IP datagram is too large for a network maximum
transmission unit (MTU) size, and the large datagram is divided into several smaller
pieces for transmission. Lower layer protocols may also set the MTU. If the MTU
that is set in lower layers differs from the MTU that is set at the IP layer, the BSR uses
the lower value.
The default MTU is 1496 bytes. Use the ip mtu command in Interface Configuration
mode to change the MTU size:
MOT (config-if)#ip mtu <68-4000>
where:
Note: The MTU cannot be set on a CMTS interface.

Configuring Static Routes

You can arrange for a router to receive and send traffic by a specific static route, and
you can set a default route to reduce the routing table size. If a path to a destination
network cannot be located by a router, the BSR forwards the traffic to the default
router, if one is defined. Static routes cause packets moving between a source and a
destination to take a specific path. Static routes are important when the software
cannot build a route to a particular destination and for specifying a gateway to which
all unroutable packets are sent.
Follow these steps to configure a static route:
1. Use the ip route command in Global Configuration mode to set a specific route
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where:
A.B.C.D is the broadcast IP address.
68-4000 is the MTU size, expressed in bytes for an 10/100 Ethernet interface.
through a network:
MOT (config)#ip route <A.B.C.D> <A.B.C.D> [<A.B.C.D> | null <0-0> | [tag
<1-4294967295>]
Configuring Interfaces and TCP/IP Features
MGBI 5-13