HP 6125G HP 6125G & 6125G/XG Blade Switches IP Multicast Configuration - Page 18

Address, Description, Flags, Scope, The Flags field contains four bits.

Page 18 highlights

Address 224.0.0.12 224.0.0.13 224.0.0.14 224.0.0.15 224.0.0.16 224.0.0.17 224.0.0.18 Description Dynamic Host Configuration Protocol (DHCP) server/relay agent All Protocol Independent Multicast (PIM) routers Resource Reservation Protocol (RSVP) encapsulation All Core-Based Tree (CBT) routers Designated Subnetwork Bandwidth Management (SBM) All SBMs Virtual Router Redundancy Protocol (VRRP) • IPv6 multicast addresses Figure 4 IPv6 multicast format The following describes the fields of an IPv6 multicast address: { 0xFF-The most significant eight bits are 11111111, which indicates that this address is an IPv6 multicast address. { Flags-The Flags field contains four bits. Figure 5 Flags field format Table 4 Flags field description Bit Description 0 Reserved, set to 0. • When set to 0, it indicates that this address is an IPv6 multicast address without an embedded RP address. R • When set to 1, it indicates that this address is an IPv6 multicast address with an embedded RP address. (The P and T bits must also be set to 1.) • When set to 0, it indicates that this address is an IPv6 multicast address not based on a unicast prefix. P • When set to 1, it indicates that this address is an IPv6 multicast address based on a unicast prefix. (The T bit must also be set to 1.) • When set to 0, it indicates that this address is an IPv6 multicast address permanently-assigned by IANA. T • When set to 1, it indicates that this address is a transient, or dynamically assigned IPv6 multicast address. { Scope-The Scope field contains four bits, which indicate the scope of the IPv6 internetwork for which the multicast traffic is intended. 7

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7
Address
Description
224.0.0.12
Dynamic Host Configuration Protocol (DHCP) server/relay agent
224.0.0.13
All Protocol Independent Multicast (PIM) routers
224.0.0.14
Resource Reservation Protocol (RSVP) encapsulation
224.0.0.15
All Core-Based Tree (CBT) routers
224.0.0.16
Designated Subnetwork Bandwidth Management (SBM)
224.0.0.17
All SBMs
224.0.0.18
Virtual Router Redundancy Protocol (VRRP)
IPv6 multicast addresses
Figure 4
IPv6 multicast format
The following describes the fields of an IPv6 multicast address:
{
0xFF
—The most significant eight bits are 11111111, which indicates that this address is an IPv6
multicast address.
{
Flags
—The Flags field contains four bits.
Figure 5
Flags field format
Table 4
Flags field description
Bit
Description
0
Reserved, set to 0.
R
When set to 0, it indicates that this address is an IPv6 multicast address without an
embedded RP address.
When set to 1, it indicates that this address is an IPv6 multicast address with an
embedded RP address. (The P and T bits must also be set to 1.)
P
When set to 0, it indicates that this address is an IPv6 multicast address not based on
a unicast prefix.
When set to 1, it indicates that this address is an IPv6 multicast address based on a
unicast prefix. (The T bit must also be set to 1.)
T
When set to 0, it indicates that this address is an IPv6 multicast address
permanently-assigned by IANA.
When set to 1, it indicates that this address is a transient, or dynamically assigned
IPv6 multicast address.
{
Scope
—The Scope field contains four bits, which indicate the scope of the IPv6 internetwork for
which the multicast traffic is intended.