10-4 S
UMMIT
S
WITCH
I
NSTALLATION
AND
U
SER
G
UIDE
R
OUTING
P
ROTOCOLS
T
RIGGERED
U
PDATES
Triggered updates occur whenever a router changes the metric for a route, and it is
required to send an update message immediately, even if it is not yet time for a regular
update message to be sent. This will generally result in faster convergence, but may also
result in more RIP-related traffic.
R
OUTE
A
DVERTISEMENT
OF
VLAN
S
VLANs that are configured with an IP address, but are configured to not route IP, have
their subnets advertised by RIP with a metric of 16 (unreachable). To disable the
advertising of a subnet completely, you must unconfigure the IP address for the VLAN
using the following command:
unconfig vlan <name> ipaddress
RIP V
ERSION
1
VERSUS
RIP V
ERSION
2
A new version of RIP, called RIP version 2, expands the functionality of RIP version 1 to
include the following:
• Variable-Length Subnet Masks (VLSMs)
• Next-hop addresses
Support for next-hop addresses allows for optimization of routes in certain
environments.
• Multicasting
RIP version 2 packets can be multicast instead of being broadcast, reducing the
load on hosts that do not support routing protocols.
Summit.bk : 10PROT.FM Page 4 Thursday, June 18, 1998 9:27 AM
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