3Com S7906E - Switch, Configuration Manual

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About the BS period:
z
By default, the BS period is determined by this formula: BS period = (BS timeout – 10) / 2. The
default BS timeout is 130 seconds, so the default BS period = (130 – 10) / 2 = 60 (seconds).
z
If this parameter is manually configured, the system will use the configured value.
About the BS timeout:
z
By default, the BS timeout value is determined by this formula: BS timeout = BS period × 2 + 10.
The default BS period is 60 seconds, so the default BS timeout = 60 × 2 + 10 = 130 (seconds).
z
If this parameter is manually configured, the system will use the configured value.
In configuration, make sure that the BS period value is smaller than the BS timeout value.
Configuring Administrative Scoping
With administrative scoping disabled, a PIM-SM domain has only one BSR. The BSR manages the
whole network. To manage your network more effectively and specifically, you can partition the PIM-SM
domain into multiple admin-scope zones. Each admin-scope zone maintains a BSR, which serves a
specific multicast group range; while the global scope zone also maintains a BSR, which serves all the
rest multicast groups.
Enabling administrative scoping
Before configuring an admin-scope zone, you must enable administrative scoping first.
Perform the following configuration on all routers in the PIM-SM domain.
Follow these steps to enable administrative scoping:
To do… Use the command… Remarks
Enter system view system-view —
Enter public instance or VPN
instance PIM view pim [ vpn-instance
vpn-instance-name ]
—
Enable administrative scoping c-bsr admin-scope
Required
Disabled by default
Configuring an admin-scope zone boundary
The boundary of each admin-scope zone is formed by ZBRs. Each admin-scope zone maintains a BSR,
which serves a specific multicast group range. Multicast protocol packets (such as assert messages
and bootstrap messages) that belong to this range cannot cross the admin-scope zone boundary.
Perform the following configuration on routers that can become a ZBR.
Follow these steps to configure an admin-scope zone boundary: