1-26About the BS period:z By default, the BS period is determined by this formula: BS period = (BS timeout – 10) / 2. Thedefault 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 ScopingWith administrative scoping disabled, a PIM-SM domain has only one BSR. The BSR manages thewhole network. To manage your network more effectively and specifically, you can partition the PIM-SMdomain into multiple admin-scope zones. Each admin-scope zone maintains a BSR, which serves aspecific multicast group range; while the global scope zone also maintains a BSR, which serves all therest multicast groups.Enabling administrative scopingBefore 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… RemarksEnter system view system-view —Enter public instance or VPNinstance PIM viewpim [ vpn-instancevpn-instance-name ] —Enable administrative scoping c-bsr admin-scope RequiredDisabled by defaultConfiguring an admin-scope zone boundaryThe 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 messagesand 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:
