Bay Networks 4000, Справочное руководство

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PPP Paths
118814-D Rev. 00 4-39
• Rip1 Subnet: This is a modified version of RIP1
mode which allows Nautica routers to work in
networks where RIP1 must be used due to an
installed base of older routers. RIP1 packets are
broadcast, but when network routes are learned via
RIP, the Nautica router applies a subnet mask as
follows:
If the route is within the same “natural” network as
the current router, the subnet mask of the LAN01
interface is used; otherwise the “natural” subnet
mask is applied to the route. This allows correct
operation of a router in a subnetted environment
where RIP1 is used.
• None: No protocol set.
Parameter: Type
Default: Split Horizon
Options: Split Horizon, Poison Reverse, Local LAN
Function: Determines how routes are passed over this path.
Instructions: The options here are as follows:
• Split Horizon: When a remote router sends a
broadcast containing route information to the local
router, the local router does not send these routes
back to the remote router.
• Poison Reverse: When a remote router sends a
broadcast containing route information to the local
router, the local router sends this information back
to the remote router with the metrics of the learned
routes set to 16 (infinite). In this way the remote
router does not re-send this information to the local
router.
• Local LAN: The remote router only broadcasts
information about routes on the local LAN and not
ISDN or other connections to remote networks.