679722

ZyXEL VES1724-56 Manual

372
Zoom out
Zoom in
Previous page
1/414
Next page
VES1724-56 User’s Guide 372
CHAPTER 45
IPv6 Cache
This chapter describe the IPv6 caches on the Switch. Refer to Section 8.6 on page 76 to see more
information about IPv6.
45.1 Overview
The Switch uses the Neighbor Discovery Protocol (NDP) to discover other IPv6 devices and track
their reachability in a network. The Switch uses the following ICMPv6 messages types:
• Neighbor solicitation: A request from a host to determine a neighbor’s link-layer address (MAC
address) and detect if the neighbor is still reachable. A neighbor being “reachable” means it
responds to a neighbor solicitation message (from the host) with a neighbor advertisement
message.
• Neighbor advertisement: A response from a node to announce its link-layer address.
• Router solicitation: A request from a host to locate a router that can act as the default router and
forward packets.
• Router advertisement: A response to a router solicitation or a periodical multicast advertisement
from a router to advertise its presence and other parameters.
An IPv6 host is required to have a neighbor cache, destination cache, prefix list and default router
list. The Switch maintains and updates its IPv6 caches constantly using the information from
response messages. In IPv6, the Switch configures a link-local address automatically, and then
sends a neighbor solicitation message to check if the address is unique. If there is an address to be
resolved or verified, the Switch also sends out a neighbor solicitation message. When the Switch
receives a neighbor advertisement in response, it stores the neighbor’s link-layer address in the
neighbor cache. When the Switch uses a router solicitation message to query for a router and
receives a router advertisement message, it adds the router’s information to the neighbor cache,
prefix list and destination cache. The Switch creates an entry in the default router list cache if the
router can be used as a default router.
When the Switch needs to send a packet, it first consults the destination cache to determine the
next hop. If there is no matching entry in the destination cache, the Switch uses the prefix list to
determine whether the destination address is on-link and can be reached directly without passing
through a router. If the address is on-link, the address is considered as the next hop. Otherwise,
the Switch determines the next-hop from the default router list or routing table. Once the next hop
IP address is known, the Switch looks into the neighbor cache to get the link-layer address and
sends the packet when the neighbor is reachable. If the Switch cannot find an entry in the neighbor
cache or the state for the neighbor is not reachable, it starts the address resolution process. This
helps reduce the number of IPv6 solicitation and advertisement messages.
… 372 …


Need help? Post your question in this forum.

Forumrules


Report abuse

Libble takes abuse of its services very seriously. We're committed to dealing with such abuse according to the laws in your country of residence. When you submit a report, we'll investigate it and take the appropriate action. We'll get back to you only if we require additional details or have more information to share.

Product:

For example, Anti-Semitic content, racist content, or material that could result in a violent physical act.

For example, a credit card number, a personal identification number, or an unlisted home address. Note that email addresses and full names are not considered private information.

Forumrules

To achieve meaningful questions, we apply the following rules:

Register

Register getting emails for ZyXEL VES1724-56 at:


You will receive an email to register for one or both of the options.


Get your user manual by e-mail

Enter your email address to receive the manual of ZyXEL VES1724-56 in the language / languages: English as an attachment in your email.

The manual is 10,29 mb in size.

 

You will receive the manual in your email within minutes. If you have not received an email, then probably have entered the wrong email address or your mailbox is too full. In addition, it may be that your ISP may have a maximum size for emails to receive.

The manual is sent by email. Check your email

If you have not received an email with the manual within fifteen minutes, it may be that you have a entered a wrong email address or that your ISP has set a maximum size to receive email that is smaller than the size of the manual.

The email address you have provided is not correct.

Please check the email address and correct it.

Your question is posted on this page

Would you like to receive an email when new answers and questions are posted? Please enter your email address.



Info