Enabling State-Refresh Capability - HP A8800 Configuration Manual

Step
1. Enter system view.
2. Create a VPN instance and
enter VPN instance view.
3. Configure a
route-distinguisher (RD) for the
VPN instance.
4. Enable IP multicast routing.
5. Enter interface view.
6. Bind the interface with a VPN
instance.
7. Enable PIM-DM.
For more information about the ip vpn-instance, route-distinguisher, and ip binding vpn-instance
commands, see MPLS Command Reference.

Enabling state-refresh capability

Pruned interfaces resume multicast forwarding when the pruned state times out. To prevent this, the router
with the multicast source attached periodically sends an (S, G) state-refresh message, which is forwarded
hop by hop along the initial multicast flooding path of the PIM-DM domain, to refresh the prune timer
state of all the routers on the path. A multi-access subnet can have the state-refresh capability only if the
state-refresh capability is enabled on all PIM routers on the subnet.
To enable the state-refresh capability:
Step
1. Enter system view.
2. Enter interface view.
3. Enable state-refresh.
Configuring state-refresh parameters
The router directly connected with the multicast source periodically sends state-refresh messages. You can
configure the interval for sending such messages.
A router may receive multiple state-refresh messages within a short time, of which some may be
duplicated messages. To keep a router from receiving such duplicated messages, you can configure the
time the router must wait before receiving the next state-refresh message. If a new state-refresh message
is received within the waiting time, the router will discard it. If this timer times out, the router will accept
a new state-refresh message, refresh its own PIM-DM state, and reset the waiting timer.
Command
system-view
ip vpn-instance vpn-instance-name
route-distinguisher
route-distinguisher
multicast routing-enable
interface interface-type
interface-number
ip binding vpn-instance
vpn-instance-name
pim dm
Command
system-view
interface interface-type
interface-number
pim state-refresh-capable
128
Description
N/A
N/A
Not configured by default.
Disabled by default.
N/A
By default, an interface belongs to
the public network, and is not
bound with any VPN instance.
Disabled by default.
Remarks
N/A
N/A
Optional.
Enabled by default.