Configuration Guide Configuring IPv6
By default, an IPv6 interface does not send RA packets.
Run the no ipv6 nd suppress-ra command in interface configuration mode to disable RA suppression.
Configuring the Maximum Number of Unresolved ND Entries
The default value is 0, indicating no restriction. It is only restricted to the ND entry capacity supported by the device.
Run the ipv6 nd unresolved number command in global configuration mode to restrict the number of unresolved
neighbors. After the entries exceed this restriction, the device does not actively resolve subsequent packets.
Configuring the Maximum Number of ND Entries Learned on an Interface
Run the ipv6 nd cache interface-limit value command in interface configuration mode to restrict the number of
neighbors learned on an interface. The default value is 0, indicating no restriction.
3.3.6 IPv6 Source Routing
Working Principle
Similar to the IPv4 loose source routing and loose record routing options, the IPv6 routing header is used to specify the
intermediate nodes that the packet passes through along the path to the destination address. It uses the following format:
Figure 3-13
One byte One byte One byte One byte
Next header
Extended
header length
Route type
= 0
Remaining
segments
Data specific to each route type
The Segments Left field is used to indicate how many intermediate nodes are specified in the routing header for the
packet to pass through from the current node to the final destination address.
Currently, two routing types are defined: 0 and 2. The Type 2 routing header is used for mobile communication. RFC 2460
defines the Type 0 routing header (similar to the loose source routing option of IPv4). The format of the Type 0 routing
header is as follows:
Figure 3-14
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