c-bsr admin-scope (IPv6)
Function
The c-bsr admin-scope command configures a BSR administrative scope in a PIM-SM domain.
The undo c-bsr admin-scope command restores the default configuration.
By default, no BSR administrative scope is configured.
Usage Guidelines
Usage Scenario
By default, each PIM-SM domain has only one BSR that serves all the devices in the entire PIM-SM domain. To achieve more effective management, you can divide a PIM-SM domain into multiple BSR administrative scopes and a global domain. This can reduce the workload of a single BSR and designate a private-network group address for users in a specific domain.
Each BSR administrative scope maintains a BSR that serves the multicast groups in a specified range. The multicast packets for the groups in a BSR administrative domain cannot travel across the boundary of the domain. The global domain maintains a BSR that serves all multicast groups that do not belong to any BSR administrative domains.
Region
Though different BSR administrative domains may serve the same group, devices in each BSR administrative domain differ. One device cannot belong to multiple BSR administrative domains. Each BSR administrative domain is independent of and isolated from each other geographically. A BSR administrative domain manages the multicast groups in a specific group address range. The multicast packets for the group in the range can be transmitted only in this administrative domain and cannot pass through the border of the BSR administrative domain.
A global domain contains all the switches on the PIM-SM network. The multicast packet that does not belong to any BSR administrative domain can be transmitted on the entire PIM network.
Group address range
Each BSR administrative domain serves the multicast groups in a specific group address range. The multicast groups that different BSR administrative domains serve can overlap. The address of the multicast group that the BSR administrative domain serves is valid only in its BSR administrative domain. That is, the multicast address is used as a private group address.
The multicast group that does not belong to any BSR administrative domain belongs to a global domain.
Multicast function
The global domain and each BSR administrative domain have their respective Candidate-Rendezvous Point (C-RP) and BSR devices. Functions enabled on these devices take effect only in the local domain. That is, the BSR mechanism and the RP election are independent of each other among administrative domains.
Each BSR administrative domain has its border. Multicast information of this domain, such as the C-RP Advertisement message and BSR BootStrap message, can be transmitted only within the domain. Multicast information of a global domain can be transmitted in the entire global domain and traverse any BSR administrative domain.
Each BSR administrative domain corresponds to a scope ID defining the range of multicast groups.
Prerequisites
IPv6 multicast routing has been enabled globally using the multicast ipv6 routing-enable command in the system view.
Precautions
The c-bsr admin-scope command needs to be run on all the devices in a PIM-SM domain.