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 82. 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.
sFlow 808