HP 6125XLG R2306-HP 6125XLG Blade Switch IP Multicast Configuration Guide - Page 157
Configuring state refresh parameters, Configuring IPv6 PIM-DM graft retry timer
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Step 1. Enter system view. 2. Enter interface view. 3. Enable the state refresh feature. Command system-view interface interface-type interface-number ipv6 pim state-refresh-capable Remarks N/A N/A By default, the state refresh feature is enabled. Configuring state refresh parameters The router directly connected with the IPv6 multicast source periodically sends state refresh messages. You can configure the interval for sending such messages on that router. A router might receive duplicate state refresh messages within a short time. To prevent this situation, you can configure the amount of time that the router must wait before receiving the next state refresh message. If the router receives a new state refresh message within the specified waiting time, it discards it. If this timer times out, the router accepts a new state refresh message, refreshes its own IPv6 PIM-DM state, and resets the waiting timer. The hop limit value of a state refresh message decrements by 1 whenever it passes a router before it is forwarded to the downstream node until the hop limit value comes down to 0. In a small network, a state refresh message might cycle in the network. To control the propagation scope of state refresh messages, configure an appropriate hop limit value based on the network size on the router directly connected with the IPv6 multicast source. To configure state refresh parameters: Step Command 1. Enter system view. system-view 2. Enter IPv6 PIM view. ipv6 pim 3. Configure the interval to send state refresh messages. state-refresh-interval interval 4. Configure the time to wait before receiving a new state refresh message. state-refresh-rate-limit time 5. Configure the hop limit value state-refresh-hoplimit of state refresh messages. hoplimit-value Remarks N/A N/A By default, the interval to send refresh messages is 60 seconds. By default, the waiting time is 30 seconds. By default, the hop limit value of state refresh messages is 255. Configuring IPv6 PIM-DM graft retry timer In IPv6 PIM-DM, graft is the only type of message that uses the acknowledgment mechanism. In an IPv6 PIM-DM domain, if a router does not receive a graft-ack message from the upstream router within the specified time after it sends a graft message, the router keeps sending new graft messages at a configurable interval (graft retry timer) until it receives a graft-ack message from the upstream router. For more information about the configuration of other timers in IPv6 PIM-DM, see "Configuring common IPv6 PIM timers." To configure the IPv6 PIM-DM graft retry timer: 150