
Configuring IP Services
3-8 114065 Rev. A
Setting the Time-to-Live Value on a Source Packet
Each IP data packet includes a time-to-live (TTL) value. The TTL value specifies
the maximum number of hops that the packet is allowed to traverse in the network
before an intermediate router discards it.
The router that originates the packet sets the TTL to a positive value. Each router
that receives the packet decrements the TTL counter by one. A router that receives
a packet with a TTL of zero discards the packet -- if the packet is not addressed to
itself. The TTL counter prevents packets from looping endlessly through the
network.
By default, IP sets the TTL field on each source packet (that is, each packet that it
originates and transmits) to 30 hops. You can use Site Manager to specify a TTL
value (overriding the default).
Setting the RIP Diameter
The RIP diameter is a hop count that the Routing Information Protocol (RIP) uses
to denote infinity. In order for RIP to operate properly, every router within the
network must be configured with an identical RIP diameter value. If RIP is
enabled, this parameter specifies the maximum number of hops within the
autonomous system; if RIP is not enabled, the IP router still uses the RIP diameter
to determine network width.
The default RIP diameter value is 15 hops. You must set this parameter so that
none of the interface cost, static cost, or route filter cost parameters exceed the
RIP diameter. We recommend that you accept the default RIP diameter value.
Use Site Manager to specify the RIP diameter.
Site Manager: Default TTL parameter: page A-41
Site Manager: RIP Diameter parameter: page A-42
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