Configuring Static Router Ports - H3C S7500 Series Operation Manual

Operation Manual – Multicast
H3C S7500 Series Ethernet Switches
Caution:
During the configuration, if the seconds argument is less than 15, the system sets
the holdtime to 15; if the seconds argument is more than 15, the system sets the
holdtime to the multiples of 15 according to the user-defined range. For example, if
you set the seconds argument to 14, the system sets the holdtime to 15; if you set
the seconds argument to 16, the system sets the holdtime to 30; if you set the
seconds argument to 31, the system sets the holdtime to 45, and so on.
When the holdtime is set to 0, the report of CPU packets to the CPU is not
suppressed.

4.2.4 Configuring Static Router Ports

I. Introduction
In a ring network or a network with double uplinks, users usually configure both primary
and secondary links over a connection in order to avoid communication interruption
due to link failure. When the primary link fails, the secondary link can replace it
immediately to avoid communication interruption.
On a link with a multicast protocol (such as PIM or IGMP) enabled, the switch cannot
restore multicast data transmission after switchover until the switch receives multicast
messages (such as PIM Hello messages and IGMP general group query messages)
and adds the static router port to the corresponding multicast entry. The process will
cause temporary interruption of multicast data transmission. For real-time services
such as IPTV, the delay will cause some undesirable problems such as picture jitter.
You can configure a port as a static router port to solve this problem. When the link state
switches, the multicast data can be switched from the primary link to the secondary link
immediately, so that the switch need not wait for multicast protocol messages and the
multicast data transmission delay is avoided. Additionally, a static port never times out
except when a link fails or the configuration is removed.
II. Configuring static router ports
Configure static router ports as follows:
Enable IGMP snooping globally
Enable multicast routing globally
Allocate an Ethernet port to the corresponding VLAN
Configure an IP address for the VLAN
Enable the multicast routing protocol on the VLAN interface
Bring the Ethernet port to the up state
Follow these steps to configure static router ports:
Chapter 4 Common Multicast Configuration
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