Avaya Configuring IP Services Manual de usuario Pagina 134

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Configuring IP Services
3-12
Parameter: Poisoned Reverse
Default: Poisoned
Options: Poisoned | Actual | Split
Function: Specifies how the RIP interface advertises routes it learns from an
adjacent network in periodic updates subsequently sent to that network.
Instructions: Select Poisoned to configure this RIP interface to implement poisoned
reverse. When poisoned reverse is enabled, the RIP interface advertises
routes to the adjacent network from which it has learned the routes. In
RIP updates, RIP uses a hop count of RIP Network Diameter plus one,
thus declaring the destination unreachable. Poisoned reverse can speed up
the convergence of the network routing tables.
Select Split to configure this RIP interface to implement a split horizon.
When split horizon is enabled, the RIP interface omits routes learned
from a neighbor in RIP updates subsequently sent to that neighbor.
Select Actual to configure this RIP interface to advertise routes with the
learned cost. This is useful on a Frame Relay interface that has virtual
connections (VCs) to different routers that are part of the same logical IP
subnet.
MIB Object ID: 1.3.6.1.4.1.18.3.5.3.2.2.2.1.9
Parameter: Time to Live
Default: 1
Range: 1 to 255 hops
Function: Specifies a TTL value to be inserted in the IP header for RIP updates.
Instructions: Certain RIP implementations ignore packets with a TTL value of 1 hop.
Use this parameter to provide interoperability with such implementations.
Setting a TTL of 1 prevents RIP updates from inadvertently getting off the
local network. Increasing the TTL introduces the risk of the update
getting off the local network and being forwarded around the network.
MIB Object ID: 1.3.6.1.4.1.18.3.5.3.2.2.2.1.11
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