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1090
Configuring IPv6 Routing
IPv6 Static Reject and Discard Routes
A static configured route with a next-hop of “null” causes any packet
matching the route to disappear or vanish from the network. This type of
route is called a “Discard” route if the router returns an ICMP “network-
unreachable” message, or is called a “Reject” route if no ICMP message is
returned. The PowerConnect 8000/8100-series switches support “Reject”
routes, where any packets matching the route network prefix silently
disappear.
A common use of a Reject route is to quickly discard packets that cannot be
delivered because a valid route to the destination is not known. Without the
Reject route, these undeliverable packets will continue to circulate through
the network, following the default routes, until their TTL expires. Forwarding
packets that cannot be delivered wastes bandwidth, particularly on expensive
WAN connections. The Reject route will also suppress a type of “Denial of
Service” (DoS) attack where an internal host sends large numbers of packets
to unknown destinations, causing congestion of the WAN links.
• ipv6 route ::/0 null 254
Use this in all routers except the ones with direct Internet connectivity.
Routers with direct Internet connectivity should advertise a default route.
The effect of this route is that when a router does not have connectivity to
the Internet, the router will quickly discard packets that it cannot deliver.
If the router learns a default route from another router, the learned route
will have a lower distance metric and therefore a higher preference. Routes
that are more specific (have more bits in the prefix) will have precedence
over less specific routes. This will cause packets destined for non-existent
networks to be quickly discarded. Also, because of the high distance metric
(254), this route will never be advertised to any neighbor routers.
• ipv6 route fc00::/7 null 254
This route covers the entire ULA (IPv6 private) address space. If you have
networks configured in this address space, you will have more specific
routes for those networks. The more specific routes (more bits of prefix)
will have precedence over this route. Any destinations in this range not
known via another, more specific route do not exist. The effect is that
packets destined for private networks that do not exist in your network will
be quickly discarded instead of being forwarded to the default route.
Содержание PowerConnect 8024
Страница 48: ...48 Contents ...
Страница 52: ...52 Introduction ...
Страница 86: ...86 Switch Features ...
Страница 140: ...140 Setting Basic Network Information ...
Страница 178: ...178 Managing a Switch Stack ...
Страница 204: ...204 Configuring Authentication Authorization and Accounting ...
Страница 272: ...272 Managing General System Settings ...
Страница 308: ...308 Configuring SNMP ...
Страница 336: ...336 Managing Images and Files ...
Страница 354: ...354 Auto Image and Configuration Update ...
Страница 385: ...Monitoring Switch Traffic 385 Figure 16 26 Configure Additional Port Mirroring Settings 9 Click Apply ...
Страница 468: ...468 Configuring Port Characteristics ...
Страница 509: ...Configuring Port and System Security 509 Figure 20 12 Configure Port Security Settings 5 Click Apply ...
Страница 512: ...512 Configuring Port and System Security ...
Страница 550: ...550 Configuring Access Control Lists ...
Страница 571: ...Configuring VLANs 571 Figure 22 6 Add Ports to VLAN 4 Click Apply 5 Verify that the ports have been added to the VLAN ...
Страница 580: ...580 Configuring VLANs Figure 22 17 GVRP Port Parameters Table ...
Страница 586: ...586 Configuring VLANs Figure 22 24 Double VLAN Port Parameter Table ...
Страница 618: ...618 Configuring VLANs ...
Страница 631: ...Configuring the Spanning Tree Protocol 631 Figure 23 5 Spanning Tree Global Settings ...
Страница 637: ...Configuring the Spanning Tree Protocol 637 Figure 23 11 RSTP LAG Settings ...
Страница 685: ...Configuring Port Based Traffic Control 685 Figure 25 3 Storm Control 5 Click Apply ...
Страница 776: ...776 Snooping and Inspecting Traffic Figure 27 17 DAI Interface Configuration Summary ...
Страница 790: ...790 Snooping and Inspecting Traffic ...
Страница 797: ...Configuring Link Aggregation 797 To view or edit settings for multiple LAGs click Show All ...
Страница 894: ...894 Configuring DHCP Server Settings ...
Страница 928: ...928 Configuring L2 and L3 Relay Features Figure 34 3 DHCP Relay Interface Summary ...
Страница 955: ...Configuring OSPF and OSPFv3 955 Figure 35 1 OSPF Configuration ...
Страница 1030: ...1030 Configuring OSPF and OSPFv3 ...
Страница 1068: ...1068 Configuring VRRP ...
Страница 1092: ...1092 Configuring IPv6 Routing ...
Страница 1112: ...1112 Configuring DHCPv6 Server and Relay Settings Relay Interface Number Vl100 Relay Remote ID Option Flags ...
Страница 1119: ...Configuring Differentiated Services 1119 Figure 40 5 DiffServ Class Criteria ...
Страница 1126: ...1126 Configuring Differentiated Services Figure 40 14 DiffServ Service Summary ...
Страница 1142: ...1142 Configuring Differentiated Services ...
Страница 1148: ...1148 Configuring Class of Service Figure 41 1 Mapping Table Configuration CoS 802 1P ...
Страница 1160: ...1160 Configuring Class of Service ...
Страница 1164: ...1164 Configuring Auto VoIP Figure 42 2 Auto VoIP Interface Configuration ...
Страница 1230: ...1230 Managing IPv4 and IPv6 Multicast Figure 43 51 DVMRP Next Hop Summary ...
Страница 1256: ...1256 Managing IPv4 and IPv6 Multicast ...
Страница 1266: ...1266 Feature Limitations and Platform Constants ...
Страница 1274: ...1274 System Process Definitions ...
Страница 1294: ...Index 1294 ...