Important Points To Remember - Dell Force10 C150 Configuration Manual

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 47-1. Extended Gateway Summary
IP SA
static/connected/IGP
static/connected/IGP
BGP
BGP
982 | sFlow
srcAS and
IP DA srcPeerAS
static/connected/IGP —
BGP 0
static/connected/IGP —
Exported
BGP Exported
dstAS and
dstPeerAS Description
— Extended gateway data is not
exported because there is no AS
information.
Exported src_as & src_peer_as are zero
because there is no AS information
for IGP.
— Prior to FTOS version 7.8.1.0,
extended gateway data is not be
exported because IP DA is not
learned via BGP.
Exported
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.
Exported
Extended gateway data is packed.