3Com MSR 50, MSR 30 manual Ripng summary-address, Poison reverse function takes effect

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Description	Use the rip split-horizoncommand to enable the split horizon function.
	Use the undo rip split-horizoncommand to disable the split horizon function.
	By default, the split horizon function is enabled.
	Note that:
	■ The split horizon function is necessary for preventing routing loops. Therefore,
	you are not recommended to disable it.
	■ In special cases, make sure that it is necessary to disable the split horizon
	function before doing so.
n	■ If both the poison reverse and split horizon functions are enabled, only the
	poison reverse function takes effect.
	■ On Frame Relay, X.25 and other non-broadcast multi-access (NBMA) links, split
	horizon should be disabled if multiple VCs are configured on the primary
	interface and secondary interfaces to ensure route advertisement. For detailed
	information, refer to “Frame Relay Configuration Commands” on page 371
	and “LAPB and X.25 Configuration Commands” on page 421.
Examples	# Enable the split horizon function on Ethernet1/0.
	<Sysname> system-view
	[Sysname] interface ethernet 1/0
	[Sysname-Ethernet1/0] ripng split-horizon
ripng summary-address
Syntax	ripng summary-addressipv6-address prefix-length
	undo ripng summary-address ipv6-addressprefix-length
View	Interface view
Parameters	ipv6-address: Destination IPv6 address of the summary route.
	prefix-length: Prefix length of the destination IPv6 address of the summary route,
	in the range of 0 to 128. It indicates the number of consecutive 1s of the prefix,
	which defines the network ID.
Description	Use the ripng summary-addresscommand to configure a summary advertised
	through the interface.
	Use the undo ripng summary-addresscommand to remove the summary.
	If the prefix and the prefix length of a route match the IPv6 prefix, the IPv6 prefix
	will be advertised instead. Thus, one route can be advertised on behalf of many
	routes. After summarization, the summary route cost is the lowest cost among
	summarized routes.