3Com 3500 - Manual (Page 457)

ip rip poisonReverse 457
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✓ 9000
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ip rip poisonReverse For CoreBuilder 9000: Applies to Layer 3 switching modules only.
Enables or disables RIP Poison Reverse mode on the system.
Valid Minimum Abbreviation
ip ri poi
Important Considerations
■
Your system always implements Split Horizon, a scheme that aims to
avoid the problems that are associated with reverse-route updates
(that is, the updates that are sent to a neighboring router that include
the routes that are learned from that router). The scheme omits the
routes that are learned from one neighbor in the updates that are sent
to that neighbor (the reverse routes). Poison reverse works with Split
Horizon as follows:
■
When you enable Poison Reverse for use with the Split Horizon
scheme (the default), the system advertises reverse routes in
updates, but sets the metrics to 16 (infinity). Setting the metric to
infinity breaks the loop immediately when two routers have routes
that point to each other.
■
When you disable Poison Reverse for the Split Horizon scheme,
reverse routes are simply not advertised.
Options
Prompt Description Possible Values [Default]
IP interfaces Index number of the interfaces
for which you want to set the
poison reverse mode
■
One or more
selectable
interface indexes
■
all
■
? (for a list of
selectable
interface
indexes)
Previous
entry, if
applicable
Poison Reverse
mode Whether you want to
implement poison reverse for
the selected interface
■
disabled
■
enabled
Current
value