Configuring Administrative Scoping - HP A5500 SI Switch Series Configuration Manual

If the RP-set information of one group range is carried in multiple BSMFs, a non-BSR router updates
•
corresponding RP-set information upon receiving all these BSMFs.
Because the RP-set information contained in each segment is different, loss of some IP fragments will not
result in dropping of the entire message.
The function of BSM semantic fragmentation is enabled by default. Devices not supporting this function
might deem a fragment as an entire message, learning only part of the RP-set information. Therefore, if
such devices exist in the BIDIR-PIM domain, you need to disable the semantic fragmentation function on
the C-BSRs.
Follow these steps to disable the BSM semantic fragmentation function:
To do...
Enter system view
Enter public network PIM view
or VPN instance PIM view
Disable the BSM semantic
fragmentation function
NOTE:
Generally, a BSR performs BSM semantic fragmentation according to the MTU of its BSR interface.
However, the semantic fragmentation of BSMs originated due to learning of a new PIM neighbor is
performed according to the MTU of the outgoing interface.

Configuring administrative scoping

With administrative scoping disabled, a BIDIR-PIM domain has only one BSR. The BSR manages the
whole network. To manage your network more effectively and specifically, partition the BIDIR-PIM
domain into multiple admin-scope zones. Each admin-scope zone maintains a BSR, which serves a
specific multicast group range. The global-scope zone also maintains a BSR, which serves all the rest
multicast groups.
Enabling administrative scoping
Before you configure an admin-scope zone, you must enable administrative scoping first.
Perform the following configuration on routers that can become a C-BSR and ZBR.
Follow these steps to enable administrative scoping:
To do...
Enter system view
Enter public network PIM view
or VPN instance PIM view
Enable administrative scoping
Use the command...
system-view
pim [ vpn-instance vpn-instance-
name ]
undo bsm-fragment enable
Use the command...
system-view
pim [ vpn-instance vpn-instance-name
]
c-bsr admin-scope
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Remarks
—
—
Required
By default, the BSM semantic
fragmentation function is
enabled.
Remarks
—
—
Required
Disabled by default