Reference Guide

sFlow | 919
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
• The IP destination address has to be learned via BGP in order to export extended-gateway data, prior to
FTOS version 7.8.1.0.
• If the IP destination address is not learned via BGP the Dell Force10 system does not export
extended-gateway data, prior to FTOS version 7.8.1.0.
• FTOS 7.8.1.0 and later enhances the sFlow implementation for real time traffic analysis on the
E-Series to provide extended gateway information in cases where the destination IP addresses are
learned by different routing protocols, and for cases where the destination is reachable over ECMP.
• If the IP source address is learned via IGP then srcAS and srcPeerAS are zero.
• The srcAS and srcPeerAS might be zero even though the IP source address is learned via BGP. The
Dell Force10 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 50-1. 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 & src_peer_as are zero because there is no
AS information for IGP.
BGP static/
connected/IGP
—
Exported
—
Exported
Prior to FTOS version 7.8.1.0, extended gateway
data is not be exported because IP DA is not
learned via BGP.
7.8.1.0 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.
BGP BGP Exported Exported
Extended gateway data is packed.