Хм...Я, конечно, начинаю забывать - но в мои времена зебра работала ничуть не хуже цисковских роутеров...На фришке.. И вообще - я преимущественно вот про такое:
Before Router 1 sends updates to Router 2, it checks the following:
Is the subnet information part of the same major net as the interface that is sourcing the update?
No. Router 1 summarizes at the major net boundary and advertises the network.
Yes. Does the network have the same subnet mask as the interface that is sourcing the update?
No. Router 1 drops the network, and does not advertise it.
Yes. Router 1 advertises the subnet.
Receive Updates When RIP or IGRP receive an update, they perform certain checks before accepting the update and applying the subnet mask. Below is the sequence of events that occurs before Router 2 accepts an update from Router 1:
Is the subnet received in the update on the same major net as the interface that received the update?
Yes. Router 2 applies the mask of the interface that received the update. If the advertised network has a host bit set in the host portion of the update, Router 2 applies the host mask (/32). In the case of RIP, it continues to advertise the /32 route to the subsequent router, but IGRP does not.
No. Do any subnets of this major net already exist in the routing table, known from interfaces other than the one that received the update? Note that the network in this update should be a major net unless the link between the two routers is an unnumbered link, in which case it is possible for the update to contain subnet information.
Yes. Router 2 ignores the update.
No. Router 2 applies a classful mask. If the update came across an unnumbered link and contains subnet information (bits in subnet portion of network are set), then Router 2 applies a host mask
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Date: 25 Sep 2004 13:46 (UTC)И вообще - я преимущественно вот про такое:
Before Router 1 sends updates to Router 2, it checks the following:
Is the subnet information part of the same major net as the interface that is sourcing the update?
No. Router 1 summarizes at the major net boundary and advertises the network.
Yes. Does the network have the same subnet mask as the interface that is sourcing the update?
No. Router 1 drops the network, and does not advertise it.
Yes. Router 1 advertises the subnet.
Receive Updates
When RIP or IGRP receive an update, they perform certain checks before accepting the update and applying the subnet mask. Below is the sequence of events that occurs before Router 2 accepts an update from Router 1:
Is the subnet received in the update on the same major net as the interface that received the update?
Yes. Router 2 applies the mask of the interface that received the update. If the advertised network has a host bit set in the host portion of the update, Router 2 applies the host mask (/32). In the case of RIP, it continues to advertise the /32 route to the subsequent router, but IGRP does not.
No. Do any subnets of this major net already exist in the routing table, known from interfaces other than the one that received the update? Note that the network in this update should be a major net unless the link between the two routers is an unnumbered link, in which case it is possible for the update to contain subnet information.
Yes. Router 2 ignores the update.
No. Router 2 applies a classful mask. If the update came across an unnumbered link and contains subnet information (bits in subnet portion of network are set), then Router 2 applies a host mask