Netopia 3220-h 用户指南
Cayman 3220-H User’s Guide
How Your Cayman 3220-H Works
December 2000
C-13
Route flushing is especially important when a port is
configured as a dial-in PPP interface, since the router will
not be able to dial out to re-establish a link after it goes
down.
configured as a dial-in PPP interface, since the router will
not be able to dial out to re-establish a link after it goes
down.
If route flushing is turned off, the router does not change
the route's status or metric when the link goes down.
Instead, it maintains its routing table entry and freezes the
RIP timer for the route. When the link comes back up, the
router continues aging the route without restarting its RIP
timer.
the route's status or metric when the link goes down.
Instead, it maintains its routing table entry and freezes the
RIP timer for the route. When the link comes back up, the
router continues aging the route without restarting its RIP
timer.
Turning route flushing off is most appropriate for dial-out
PPP interfaces, since you may want the router to hold onto
routes it acquired dynamically over a PPP link and not time
them out after the link closes. If the router receives a
packet destined for a network on the other side of the
down PPP link, it dials out to re-establish the link.
PPP interfaces, since you may want the router to hold onto
routes it acquired dynamically over a PPP link and not time
them out after the link closes. If the router receives a
packet destined for a network on the other side of the
down PPP link, it dials out to re-establish the link.
About PPP over
Ethernet (PPPoE)
Ethernet (PPPoE)
PPP (Point-to-Point Protocol) over Ethernet is an emerging
technology that lets a personal computer or network connect with
a high-speed data network over a cable or xDSL modem.
technology that lets a personal computer or network connect with
a high-speed data network over a cable or xDSL modem.
Advantages of
PPPoE
PPPoE
PPPoE simplifies deployment of high-speed networks. PPPoE
provides access to high-speed (xDSL or cable modem) networks
while preserving familiar dial-up models for Internet access.
Consequently, users and ISPs can transition from dial-up
network access to PPPoE network access quickly and
inexpensively.
provides access to high-speed (xDSL or cable modem) networks
while preserving familiar dial-up models for Internet access.
Consequently, users and ISPs can transition from dial-up
network access to PPPoE network access quickly and
inexpensively.
PPPoE integrates easily into dial-up ISP infrastructure. Carriers
and ISPs who are moving from a dial-up network base to a
broadband network base can continue using their existing
authentication, billing, access control, and IP address
management models.
and ISPs who are moving from a dial-up network base to a
broadband network base can continue using their existing
authentication, billing, access control, and IP address
management models.