240
C
HAPTER
12: I
NTERNET
P
ROTOCOL
(IP)
ip interface
Layer 2
Switching
Modules
✓
Multilayer
Switching
Modules
icmpRouterDiscovery
Enables or disables Internet Control Message Protocol (ICMP) router
discovery on a Multilayer Switching Module. ICMP router discovery
enables hosts that are attached to multicast or broadcast networks to
discover the IP addresses of their neighboring routers and determine
which router to use for a default gateway.
Valid Minimum Abbreviation
ip i icmpro
Important Considerations
■
ICMP router discovery can be set on a per-interface basis.
■
When you enable the state for an interface, the module prompts you
for a preference. (See RFC 1256.) By default, this preference level is
0
.
Use the preference to control the use of certain routers as the default
router. The host uses the router with the highest preference level.
■
An appropriately configured end station can locate one or more
routers on the LAN to which it is attached. The end station then
automatically installs a default route to each of the routers that are
running ICMP router discovery. You do not need to manually configure
a default route. ICMP redirect messages subsequently channel the IP
traffic to the correct router.
■
You can configure only certain end stations to work with the ICMP
router discovery protocol. See the documentation for your
workstation to determine whether you can configure it to work with
this protocol.
■
You can configure and display three timers for ICMP router discovery:
■
Maximum advertisement interval
— The maximum time
interval between advertisements.
■
Minimum advertisement interval
— The minimum time interval
between advertisements.
■
Advertisement holdtime
— The length of time that
advertisements are held valid.
The ranges for minimum advertisement interval depend on the set values
for maximum advertisement interval and the holdtime range depends on
the input values for both the maximum and minimum advertisement
intervals.
Summary of Contents for 4007
Page 1: ...http www 3com com Switch 4007 Command Reference Guide Part No 10013693 Published May 2000...
Page 14: ......
Page 22: ...22 ABOUT THIS GUIDE...
Page 34: ...34 CHAPTER 1 ADMINISTRATION OVERVIEW...
Page 78: ...78 CHAPTER 4 SIMPLE NETWORK MANAGEMENT PROTOCOL SNMP...
Page 100: ...100 CHAPTER 5 ETHERNET PORTS...
Page 174: ...174 CHAPTER 9 RESILIENT LINKS...
Page 322: ...322 CHAPTER 13 VIRTUAL ROUTER REDUNDANCY VRRP...
Page 476: ...476 CHAPTER 16 INTERNET PACKET EXCHANGE IPX...
Page 552: ...552 CHAPTER 18 QUALITY OF SERVICE QOS AND RESOURCE RESERVATION PROTOCOL RSVP...
Page 566: ...566 APPENDIX A TECHNICAL SUPPORT...