Configuration Guidelines - Lenovo RackSwitch G8264CS Application Manual

Configuration Guidelines

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 DNS client
DNS commands support both IPv4 and IPv6 addresses. Link‐local addresses are
not supported. Use the following command to specify the type of DNS query to
be sent first:
RS 8264CS(config)# ip dns ipv6 request-version {ipv4|ipv6}
If you set the request version to ipv4, the DNS application sends an A query
first, to resolve the hostname with an IPv4 address. If no A record is found for
that hostname (no IPv4 address for that hostname) an AAAA query is sent to
resolve the hostname with a IPv6 address.
If you set the request version to ipv6, the DNS application sends an AAAA query
first, to resolve the hostname with an IPv6 address. If no AAAA record is found
for that hostname (no IPv6 address for that hostname) an A query is sent to
resolve the hostname with an IPv4 address.
When you configure an interface for IPv6, consider the following guidelines:
 Support for subnet router anycast addresses is not available.
 A single interface can accept either IPv4 or IPv6 addresses, but not both IPv4
and IPv6 addresses.
 A single interface can accept multiple IPv6 addresses.
A single interface can accept only one IPv4 address.

 If you change the IPv6 address of a configured interface to an IPv4 address, all
IPv6 settings are deleted.
 A single VLAN can support only one IPv6 interface.
Health checks are not supported for IPv6 gateways.

 IPv6 interfaces support Path MTU Discovery. The CPU's MTU is fixed at 1500
bytes.
 Support for jumbo frames (1,500 to 9,216 byte MTUs) is limited. Any jumbo
frames intended for the CPU must be fragmented by the remote node. The
switch can re‐assemble fragmented packets up to 9k. It can also fragment and
transmit jumbo packets received from higher layers.
Chapter 23: Internet Protocol Version 6
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