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FTOS Configuration Guide for the C-Series - Force10 Networks

FTOS Configuration Guide for the C-Series - Force10 Networks

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• extended-gateway — Source and destination AS number and <strong>the</strong> BGP next-hop.<br />

Note: The entire AS path is not included. BGP community-list and local preference in<strong>for</strong>mation are not<br />

included. These fields are assigned default values and are not interpreted by <strong>the</strong> collector.<br />

Use <strong>the</strong> command sflow [extended-switch] [extended-router] [extended-gateway] enable<br />

command. By default packing of any of <strong>the</strong> extended in<strong>for</strong>mation in <strong>the</strong> datagram is disabled.<br />

Use <strong>the</strong> command show sflow to confirm that extended in<strong>for</strong>mation packing is enabled, as shown in<br />

Figure 206.<br />

Figure 206 Confirming that Extended sFlow is Enabled<br />

<strong>Force10</strong>#show sflow<br />

sFlow services are disabled<br />

Global default sampling rate: 32768<br />

Global default counter polling interval: 20<br />

Global extended in<strong>for</strong>mation enabled: gateway, router, switch<br />

0 collectors configured<br />

0 UDP packets exported<br />

0 UDP packets dropped<br />

0 sFlow samples collected<br />

0 sFlow samples dropped due to sub-sampling<br />

If none of <strong>the</strong> extended in<strong>for</strong>mation is enabled, <strong>the</strong> show output is as shown in Figure 207.<br />

Figure 207 Confirming that Extended sFlow is Disabled<br />

<strong>Force10</strong>#show sflow<br />

sFlow services are disabled<br />

Global default sampling rate: 32768<br />

Global default counter polling interval: 20<br />

Global extended in<strong>for</strong>mation enabled: none<br />

0 collectors configured<br />

0 UDP packets exported<br />

0 UDP packets dropped<br />

0 sFlow samples collected<br />

0 sFlow samples dropped due to sub-sampling<br />

Important Points to Remember<br />

• The IP destination address has to be learned via BGP in order to export extended-gateway data.<br />

• If <strong>the</strong> IP destination address is not learned via BGP <strong>the</strong> <strong>Force10</strong> system does not export<br />

extended-gateway data.<br />

• If <strong>the</strong> IP source address is learned via IGP <strong>the</strong>n srcAS and srcPeerAS are zero.<br />

• The srcAS and srcPeerAS might be zero even though <strong>the</strong> IP source address is learned via BGP. The<br />

<strong>Force10</strong> system packs <strong>the</strong> srcAS and srcPeerAS in<strong>for</strong>mation only if <strong>the</strong> route is learned via BGP and it<br />

is reachable via <strong>the</strong> ingress interface of <strong>the</strong> packet.<br />

310 sFlow

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