Administrator Guide

By default packing of any of the extended information in the datagram is disabled.
• Confirm that extended information packing is enabled.
show sflow
The bold line shows that extended sFlow settings are enabled on all three types.
Dell#show sflow
sFlow services are enabled
Global default sampling rate: 4096
Global default counter polling interval: 15
Global extended information enabled: gateway, router, switch
1 collectors configured
Collector IP addr: 10.10.10.3, Agent IP addr: 10.10.0.0, UDP port: 6343
77 UDP packets exported
0 UDP packets dropped
165 sFlow samples collected
69 sFlow samples dropped due to sub-sampling
Linecard 1 Port set 0 H/W sampling rate 8192
Gi 1/16: configured rate 8192, actual rate 8192, sub-sampling rate 1
Gi 1/17: configured rate 16384, actual rate 16384, sub-sampling rate 2
Linecard 3 Port set 1 H/W sampling rate 16384
Gi 3/40: configured rate 16384, actual rate 16384, sub-sampling rate 1
If you did not enable any extended information, the show output displays the following (shown in bold).
Dell#show sflow
sFlow services are disabled
Global default sampling rate: 32768
Global default counter polling interval: 20
Global extended information enabled: none
0 collectors configured
0 UDP packets exported
0 UDP packets dropped
0 sFlow samples collected
0 sFlow samples dropped due to sub-sampling
Important Points to Remember
• If the IP source address is learned via IGP, srcAS and srcPeerAS are zero.
• The srcAS and srcPeerAS might be zero even though the IP source address is learned via BGP. The c system packs the srcAS and
srcPeerAS information only if the route is learned via BGP and it is reachable via the ingress interface of the packet.
The previous points are summarized in following table.
Table 107. Extended Gateway Summary
IP SA IP DA srcAS and srcPeerAS dstAS and dstPeerAS Description
static/connected/IGP static/connected/IGP — — Extended gateway data is
not exported because
there is no AS
information.
static/connected/IGP BGP 0 Exported src_as and src_peer_as
are zero because there is
no AS information for
IGP.
BGP static/connected/IGP
—
Exported
—
Exported
The system allows
extended gateway
information in cases
where the source and
destination IP addresses
are learned by different
routing protocols, and for
cases where is source is
reachable over ECMP.
858 sFlow