Configuring Optional Parameters for RAs

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Configuring Optional Parameters for RAs

In addition to enabling the RA functionality, you can configure the following IPv6 neighbor discovery and RA options on a VLAN:

Neighbor discovery reachable time – the time, in milliseconds, that a node assumes a neighbor is reachable after receiving a reachability confirmation.

Neighbor discovery retransmit time – the time, in milliseconds, between retransmitted Neighbor Solicitation messages.

RA DNS – the IPv6 recursive DNS Server for the VLAN.

On Linux systems, clients must run the open rdnssd daemon to support theDNSDomain Name System. A DNS server functions as a phone book for the intranet and Internet users. It converts human-readable computer host names into IP addresses and IP addresses into host names. It stores several records for a domain name such as an address 'A' record, name server (NS), and mail exchanger (MX) records. The Address 'A' record is the most important record that is stored in a DNS server, because it provides the required IP address for a network peripheral or element.server option.

Windows 7 does not support theDNSDomain Name System. A DNS server functions as a phone book for the intranet and Internet users. It converts human-readable computer host names into IP addresses and IP addresses into host names. It stores several records for a domain name such as an address 'A' record, name server (NS), and mail exchanger (MX) records. The Address 'A' record is the most important record that is stored in a DNS server, because it provides the required IP address for a network peripheral or element.server option.

RA hop-limit – the IPv6 RA hop-limit value. It is the default value to be placed in the Hop Count field of the IP header for outgoing (unicast) IP packets.

RA interval – the maximum and minimum time interval between sending unsolicited multicast RA from the interface, in seconds.

RA lifetime – the lifetime associated with the default router in seconds. A value of zero indicates that the router is not a default router and will not appear on the default router list. The router lifetime applies only to the router's usefulness as a default router; it does not apply to information contained in other message fields or options.

RA managed configuration flag (Enable DHCP for address) – a flag that indicates that the hosts can use the DHCP server for address autoconfiguration besides using RAs.

RA MTU – the MTU that all the nodes on a link use.

RA其他配置国旗为o(启用DHCPther information – a flag that indicates that the hosts can use the administered (stateful) protocol for autoconfiguration of other (non-address) information.

RA preference – the preference associated with the default router.

You can use the WebUI or CLI to configure these options.

It is recommended that you retain the default value of theRARouter Advertisement. The RA messages are sent by the routers in the network when the hosts send multicast router solicitation to the multicast address of all routers.interval to achieve better performance.

If you enable RAs on more than 100VLANVirtual Local Area Network. In computer networking, a single Layer 2 network may be partitioned to create multiple distinct broadcast domains, which are mutually isolated so that packets can only pass between them through one or more routers; such a domain is referred to as a Virtual Local Area Network, Virtual LAN, or VLAN.interfaces, some of the interfaces may not send out the RAs at regular intervals.

下面的过程介绍如何配置the optional parameters.

1.In theManaged Networknode hierarchy, navigate to theConfiguration > Interfaces >VLANstab.

2.Select aVLANVirtual Local Area Network. In computer networking, a single Layer 2 network may be partitioned to create multiple distinct broadcast domains, which are mutually isolated so that packets can only pass between them through one or more routers; such a domain is referred to as a Virtual Local Area Network, Virtual LAN, or VLAN.name under theVLANstab.

3.Select the correspondingVLANVirtual Local Area Network. In computer networking, a single Layer 2 network may be partitioned to create multiple distinct broadcast domains, which are mutually isolated so that packets can only pass between them through one or more routers; such a domain is referred to as a Virtual Local Area Network, Virtual LAN, or VLAN.ID from theVLANs table and clickIPv6tab.

4.Expand theNeighbor Discoveryaccordion and configure the following neighbor discovery and RA options for the VLAN based on your requirements:

a.Select theRA advertisements(ra)check box to enableRARouter Advertisement. The RA messages are sent by the routers in the network when the hosts send multicast router solicitation to the multicast address of all routers.advertisements.

b.Enter a value in theReachable time (ms)field. The allowed range is 0-3,600,000 msec. The default value is zero.

c.Enter a value in theRetransmit time(ms)field. The allowed range is 0-3,600,000 msec. The default value is zero.

d.Enter a hop-limit value in theRA hop limitfield. The allowed range is 1-255. The default value is 64.

e.Enter a value in theRA interval minimum (sec) and RA interval maximum (sec)fields. Allowed range is 3-0.75 times the maximumRARouter Advertisement. The RA messages are sent by the routers in the network when the hosts send multicast router solicitation to the multicast address of all routers.interval value in seconds. The default minimum value is 0.33 times the maximumRARouter Advertisement. The RA messages are sent by the routers in the network when the hosts send multicast router solicitation to the multicast address of all routers.interval value

f.Enter a value in theRA lifetime(sec)field. A value of zero indicates that the router is not a default router. Apart from a zero value, the allowed range for the lifetime value is the RA interval time to 9,000 seconds. The default and minimum value is three times the RA interval time.

g.Click+inRA Prefixes, enterIPV6 RAandIPV6 RA Prefix. ClickOK.

h.Click+in theRecursive DNS serversfield, and enter aDNS IPV6 addressin theAdd DNS Serverpop-up. ClickOK.

i.SelectEnabledfrom theDHCP for addressdrop-down list to enable the hosts to use the DHCP server for address autoconfiguration apart from any addresses auto configured using the RA.

j.Enter a value in theRA MTU optionfield. The allowed range is 1,280-maximum MTU allowed for the link.

k.ClickDHCP for other infocheck box to enable the hosts to use the DHCP server for autoconfiguration of other (non-address) information.

l.Select theRouter preferenceasHigh,Medium, orLow.

5.ClickSubmit.

6.ClickPending Changes.

7.In thePending Changeswindow, select the check box and clickDeploy changes.

Execute the followingCLICommand-Line Interface. A console interface with a command line shell that allows users to execute text input as commands and convert these commands to appropriate functions.commands to configure the neighbor discovery andRARouter Advertisement. The RA messages are sent by the routers in the network when the hosts send multicast router solicitation to the multicast address of all routers.options for aVLANVirtual Local Area Network. In computer networking, a single Layer 2 network may be partitioned to create multiple distinct broadcast domains, which are mutually isolated so that packets can only pass between them through one or more routers; such a domain is referred to as a Virtual Local Area Network, Virtual LAN, or VLAN.interface:

To configure neighbor discovery reachable time:

(host) [md] (config) #interface vlan

(host) [md] (config-subif)#ipv6 nd reachable-time

To configure neighbor discovery retransmit time:

(host) [md] (config-subif)#ipv6 nd retransmit-time