Dell FCX624-E Laptop User Manual


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1428 PowerConnect B-Series FCX Configuration Guide
53-1002266-01
sFlow
A
The configuration procedures for sFlow version 5 are the same as for sFlow version 2, except where
explicitly noted. Configuration procedures for sFlow are in the section “Configuring and enabling
sFlow” on page 1430. The features and CLI commands that are specific to sFlow version 5 are
described in the section “Configuring sFlow version 5 features” on page 1436.
sFlow support for IPv6 packets
The implementation of sFlow features support IPv6 packets. This support includes extended router
information and extended gateway information in the sampled packet. Note that sFlow support for
IPv6 packets exists only on devices running software that supports IPv6.
The configuration procedures for this feature are the same as for IPv4, except where the collector is
a link-local address on a Layer 3 switch. For details refer to “Specifying the collector” on
page 1431.
Extended router information
IPv6 sFlow sampled packets include the following extended router information:
IP address of the next hop router
Outgoing VLAN ID
Source IP address prefix length
Destination IP address prefix length
Note that in IPv6 devices, the prefix lengths of the source and destination IP addresses are
collected if BGP is configured and the route lookup is completed. In IPv4 devices, this information is
collected only if BGP is configured on the devices.
Extended gateway information
If BGP is enabled, extended gateway information is included in IPv6 sFlow sampled packets,
including the following BGP information about a packet destination route:
The autonomous system (AS) number for the router
The source IP AS of the route
The source peer AS for the route
The AS patch to the destination
NOTE
AS communities and local preferences are not included in the sampled packets.
To obtain extended gateway information, use “struct extended_gateway” as described in RFC 3176.
IPv6 packet sampling
IPv6 sampling is performed by the packet processor. The system uses the sampling rate setting to
selectively mark the monitoring bit in the header of an incoming packet. Marked packets tell the
CPU that the packets are subject to sFlow sampling.