Allied Telesis 86251-08 manual Router Advertisement Messages

Page 48

48

 

Patch Release Note

 

Table 9: Router Discovery Process

 

 

 

 

 

When ...

Then ...

 

 

 

 

Router Discovery advertising starts on a

the router multicasts a router advertisement

 

router interface because:

and continues to multicast them periodically

 

- the router starts up, or

until router advertising is disabled.

-advertisements are enabled on the switch or on an interface

a host starts up

the host may send a router solicitation

 

message.

 

 

the router receives a router solicitation

the router multicasts an early router

 

advertisement on the multicast interface on

 

which it received the router solicitation.

 

 

a host receives a router advertisement

the host stores the IP address and preference

 

level for the advertisement lifetime.

the lifetime of all existing router advertisements on a host expires

the host sends a router solicitation.

a host does not receive a router

the host waits for the next unsolicited router

advertisement after sending a small number

advertisement

of router solicitations

 

 

 

a host needs a default router address

the host uses the IP address of the router or

 

L3 switch with the highest preference level.

 

 

Router Discovery advertising is deleted from

the router multicasts a router advertisement

the physical interface (DELETE IP ADVERTISE

with the IP address(es) that stopped

command), or the logical interface has

advertising, and a lifetime of zero (0). It

ADVERTISE set to NO (SET IP INTERFACE

continues to periodically multicast router

command)

advertisements for other interfaces.

 

 

the router receives a router advertisement

the router does nothing but silently discards

from another router

the message.

 

 

Router Advertisement Messages

Router Solicitation Messages

A router advertisement is an ICMP (type 10) message containing:

■In the destination address field of the IP header, the interface's configured advertisement address, either 224.0.0.1 (ALL) or 255.255.255.255 (LIMITED).

■In the lifetime field, the interface's configured advertisement lifetime.

■In the Router Address and Preference Level fields, the addresses and preference levels of all the logical interfaces that are set to advertise.

A router solicitation is an ICMP (type 10) message containing:

■Source Address: an IP address belonging to the interface from which the message is sent

■Destination Address: the configured Solicitation Address, and

■Time-to-Live: 1 if the Destination Address is an IP multicast address; at least 1 otherwise.

Router Advertisement The router advertisement interval is the time between router advertisements. Interval For the first few advertisements sent from an interface (up to 3), the router

sends the router advertisements at intervals of at most 16 seconds. After these initial transmissions, it sends router advertisements at random intervals between the minimum and maximum intervals that the user configures, to reduce the probability of synchronization with the advertisements from other

Patch 86251-08 for Software Release 2.5.1 C613-10356-00 REV I

Page 47 Page 49
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Page 47 Page 49
Contents Patch For Rapier Series Switches IntroductionFeatures PCR Module IPG LevelPCR 03359 Module Core Level PCR Module BGP LevelPCR 03684 Module Core Level PCR Module TTY, User LevelPCR Module STP Level PCR Module FIRE, Utility LevelPCR Module Isakmp Level PCR Module Ipsec LevelPCR Module SW56 Level PCR Module Firewall LevelPCR Module SWI Level PCR Module IGP LevelPCR 31001 Module Dhcp Level PCR Module Utility LevelPCR Module BGP Level PCR 31081 Module VRRP, IP, TCP, Telnet PCR Module File LevelPCR Module FFS Level PCR 31098 Module Dhcp LevelPCR 31106 Module MLD Level PCR Module IPX2 LevelPCR 02414 Module IPV6, SWI, IPG, Vlan PCR Module IPGPCR Module OSPF, IPG Level PCR Module ETH, IPG, IPv6, IPX LevelPCR 03751 Module Mlds Level PCR Module FILE, INSTALL, SCR Level PCR Module Install LevelPCR Module ETH Level PCR 03801 Module Mlds LevelPCR 03823 Module Vlan Level PCR 03843 Module Dhcp LevelPCR Module IPG, IPV6 Level PCR 03870 Module SWI, Vlan LevelPCR Module DHCP, Telnet Level PCR Module TTY LevelPCR Module Switch Level PCR Module IP ARP LevelPCR Module Ikmp Level PCR Module Firewall Network affecting No PCR Module Ospf Network affecting No PCR Module L2TP LevelPCR Module PRI Level PCR Module PPP LevelPCR 03515 Module Dhcp Level PCR Module BGP, TCP Level PCR Module HTTP, Firewall LevelPCR 03547 Module Dhcp Level PCR Module Http Level PCR Module FIREWALL, IPG Level PCR 03584 Module MLD LevelPCR Module Ping Level PCR 03615 Module Load Level PCR 03618 Module Dhcp LevelPCR Module STP, SWI Level PCR 03647 Module Snmp Level PCR Module PKI Level PCR 03691 Module Dvmrp LevelPCR 03698 Module Dvmrp Level PCR 03708 Module Dhcp LevelPCR Module PPP, VJC Level PCR Module IP LevelPCR Module Vrrp Level PCR Module Rsvp LevelFeatures PCR 03371 Module Dhcp Level PCR Module IPSEC, Ikmp LevelPCR Module SSL Level PCR 03405 Module Stream Level PCR 03410 Module VLAN, Core LevelPCR 03424 Module Dhcp Level PCR 03429 Module SWI, Vlan LevelPCR 03436 Module IP, Dhcp Level PCR Module IPX LevelPCR 03443 Module Dhcp Level PCR Module FR LevelPCR 03465 Module Dhcp Level PCR 03492 Module HTTP, Load Level PCR Module BGP, Firewall LevelPCR 03515 Module Dhcp Level PCR 02577 Module IPG, LOG Level PCR Module GUI LevelPCR 03089 Module Core Level PCR 03094 Module STP, Vlan LevelPCR 03096 Module Vlan Level PCR Module PIM, DVMRP, IPG LevelPCR 03109 Module LOG Level PCR Module Classifier LevelPCR Module ETH, IPG Level PCR Module IPG, SWI LevelPCR Module Cure Level PCR Module Port LevelPCR 03153 Module ACC Level PCR Module PCI LevelPCR 03167 Module Dvmrp Level PCR Module CORE, FFS, TTY Level PCR Module FIREWALL, LB LevelPCR Module LB Level PCR Module User LevelPCR 03205 Module Dhcp Level PCR 03229 Module Load LevelPCR 03239 Module QOS Level PCR Module SWI, IPG, PIM LevelPCR 03247 Module MVR Level PCR 03256 Module MLD Level PCR Module VLAN, IPG LevelPCR Module DHCP, Q931, Telnet Level PCR 03334 Module MVR Level PCR 03336 Module Core LevelPCR 03346 Module Snmp Level PCR Module IP, SWI LevelPCR 03370 Module MVR Level VlanPCR 03388 Module Dhcp Level ADD PPP Create PPP Delete PPP SET PPP Show PPP PCR 03067 Module Dhcp Level PCR 03068 Module SWI, QOS LevelPCR 03077 Module Core Level PCR Module IPV6 Network affecting NoPCR Module SWI Network affecting No PCR Module IPG Network affecting NoPCR Module PCI Network affecting No PCR Module IPG, ETH Network affecting NoAvailability Icmp Router Discovery Advertisements PCR Module TELNET, PING, IPV6, Network affecting NoPCR Module TCP Network affecting No PCR Module TM Network affecting NoRouter Advertisement Messages To change these settings, use one of the commands ADD IP Interface SET IP Interface Enable IP Advertise Disable IP AdvertiseADD IP Advertise Interface Delete IP Advertise Interface SET IP Advertise Interface Example output from the Show IP Advertise command Show IP AdvertiseSame subnet Adopting the Vrrp IP Address MLD Snooping Ping Polling of Device Reachability Down device unreachable Enable and Disable Icmp Messages Icmp RedirectCommands Disable IP IcmpreplyStatic Igmp Show IP IcmpreplyConfiguration Example Commands Show IP IgmpSee Also Show IP Igmp Debug ADD IP Igmp Destination Create IP Igmp Destination Delete IP Igmp Destination Destroy IP Igmp DestinationDisable IP Igmp Debug Enable IP Igmp DebugChecking the Port Map on Rapier16fi Switches Show IP Igmp DebugHow to check that the port map is correct How to restore the correct port map PPPoE Client on Vlan Interfaces Force Eprom download Y ?ADD PPP Create PPP Delete PPP SET PPPVLANn-servicename, TNL- callname Show PPPShow PPP
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