HP 6125XLG - Configuring Ipv6 Multicast Source Registration

296
Ste
p
Command Remarks
1. Enter system view.
system-view
N/A
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Configuring an IPv6 PIM
domain border.
ipv6 pim bsr-boundary
By default, no IPv6 PIM domain
border is configured.
Disabling the BSM semantic fragmentation function
Generally, a BSR periodically advertises the RP-set information in BSMs within the IPv6 PIM-SM domain.
It encapsulates a BSM in an IPv6 datagram. When a BSM exceeds the MTU, it is split into multiple BSM
fragments (BSMFs). The loss of a single IP fragment leads to unavailability of the entire message.
Semantic fragmentation of BSMs can solve this issue. When a non-BSR receives a BSMF, it examines the
RP-set information for an IPv6 multicast group range:
• If the RP-set information is carried in one BSMF, the router directly updates the RP-set information for
the group range.
• If the RP-set information is carried in multiple BSMFs, the router updates the RP-set information for the
group range after receiving all these BSMFs. The loss of some IP fragments does not result in
dropping of the entire BSM.
The BSM semantic fragmentation function is enabled by default. A device that does not support this
function might regard a fragment as a BSM. Therefore, the device learns only part of the RP-set
information. If such devices exist in the IPv6 PIM-SM domain, you must disable the BSM semantic
fragmentation function on the C-BSRs.
To disable the BSM semantic fragmentation function:
Ste
p
Command Remarks
1. Enter system view.
system-view
N/A
2. Enter IPv6 PIM view.
ipv6 pim [ vpn-instance
vpn-instance-name ]
N/A
3. Disable the BSM semantic
fragmentation function.
undo bsm-fragment enable
By default, BSM semantic
fragmentation is enabled.
NOTE:
Generally, a BSR performs BSM semantic fragmentation according to the MTU of its BSR interface. For
BSMs originated due to learning of a new IPv6 PIM neighbor, semantic fragmentation is performed
according to the MTU of the interface that sends the BSMs.
Configuring IPv6 multicast source registration
In an IPv6 PIM-SM domain, the source-side DR sends register messages to the RP, and these register
messages have different IPv6 multicast source or IPv6 multicast group addresses. To limit the IPv6
multicast groups to which an RP is designated, you can configure an ACL to filter register messages.
Under one of the following conditions, the RP sends a register-stop message to the DR to stop the
registration process.
• The register message of an (S, G) entry is denied by the ACL.