Brocade Communications Systems Brocate Ethernet Access Switch 6910 User Manual
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Brocade 6910 Ethernet Access Switch Configuration Guide
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Setting the Switch’s IP Address (IP Version 6)
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MTU – Sets the size of the maximum transmission unit (MTU) for IPv6 packets sent on an
interface. (Range: 1280-65535 bytes; Default: 1500 bytes)
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The maximum value set in this field cannot exceed the MTU of the physical interface,
which is currently fixed at 1500 bytes.
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If a non-default value is configured, an MTU option is included in the router
advertisements sent from this device. This option is provided to ensure that all nodes on a
link use the same MTU value in cases where the link MTU is not otherwise well known.
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IPv6 routers do not fragment IPv6 packets forwarded from other routers. However, traffic
originating from an end-station connected to an IPv6 router may be fragmented.
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All devices on the same physical medium must use the same MTU in order to operate
correctly.
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IPv6 must be enabled on an interface before the MTU can be set. If an IPv6 address has
not been assigned to the switch, “N/A” is displayed in the MTU field.
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ND DAD Attempts – The number of consecutive neighbor solicitation messages sent on an
interface during duplicate address detection. (Range: 0-600, Default: 3)
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Configuring a value of 0 disables duplicate address detection.
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Duplicate address detection determines if a new unicast IPv6 address already exists on
the network before it is assigned to an interface.
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Duplicate address detection is stopped on any interface that has been suspended (see
on page 722). While an interface is suspended, all unicast
IPv6 addresses assigned to that interface are placed in a “pending” state. Duplicate
address detection is automatically restarted when the interface is administratively
re-activated.
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An interface that is re-activated restarts duplicate address detection for all unicast IPv6
addresses on the interface. While duplicate address detection is performed on the
interface’s link-local address, the other IPv6 addresses remain in a “tentative” state. If no
duplicate link-local address is found, duplicate address detection is started for the
remaining IPv6 addresses.
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If a duplicate address is detected, it is set to “duplicate” state, and a warning message is
sent to the console. If a duplicate link-local address is detected, IPv6 processes are
disabled on the interface. If a duplicate global unicast address is detected, it is not used.
All configuration commands associated with a duplicate address remain configured while
the address is in “duplicate” state.
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If the link-local address for an interface is changed, duplicate address detection is
performed on the new link-local address, but not for any of the IPv6 global unicast
addresses already associated with the interface.
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ND NS Interval – The interval between transmitting IPv6 neighbor solicitation messages on an
interface. (Range: 1000-3600000 milliseconds;
Default: 1000 milliseconds is used for neighbor discovery operations,
0 milliseconds is advertised in router advertisements)
This attribute specifies the interval between transmitting neighbor solicitation messages when
resolving an address, or when probing the reachability of a neighbor. Therefore, avoid using
very short intervals for normal IPv6 operations.
When a non-default value is configured, the specified interval is used both for router
advertisements and by the router itself.