Users Guide

Important Points to Remember
• To export extended-gateway data, BGP must learn the IP destination address.
• If the IP destination address is not learned via BGP the Dell Networking system does not export extended-gateway data.
• 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 sFlow sampling functionality is supported only for egress traffic and not for ingress traffic.
The previous points are summarized in following table.
Table 85. 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
Prior to Dell Networking
OS version 7.8.1.0,
extended gateway data is
not exported because IP
DA is not learned via
BGP.
Version 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.
806 sFlow