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7.8.1.0 - Force10 Networks

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Capturing PDUs<br />

Capture incoming and outgoing PDUs on a per-peer basis using the command capture bgp-pdu<br />

neighbor direction. Disable capturing using the no form of this command.<br />

The buffer size supports a maximum value between 40 MB (the default) and 100 MB. The capture buffers<br />

are cyclic, and reaching the limit prompts the system to overwrite the oldest PDUs when new ones are<br />

received for a given neighbor or direction. Setting the buffer size to a value lower than the current max,<br />

might cause captured PDUs to be freed to set the new limit.<br />

Note: Memory on RP1 is not pre-allocated, but is allocated only when a PDU needs to be captured.<br />

Use the command capture bgp-pdu max-buffer-size (Figure 143) to change the maximum buffer size.<br />

View the captured PDUs using the command show capture bgp-pdu neighbor.<br />

Figure 143 Viewing Captured PDUs<br />

<strong>Force10</strong>#show capture bgp-pdu neighbor 20.20.20.2<br />

Incoming packet capture enabled for BGP neighbor 20.20.20.2<br />

Available buffer size 40958758, 26 packet(s) captured using 680 bytes<br />

PDU[1] : len 101, captured 00:34:51 ago<br />

ffffffff ffffffff ffffffff ffffffff 00650100 00000013 00000000 00000000 419ef06c<br />

00000000<br />

00000000 00000000 00000000 00000000 0181a1e4 0181a25c 41af92c0 00000000 00000000<br />

00000000<br />

00000000 00000001 0181a1e4 0181a25c 41af9400 00000000<br />

PDU[2] : len 19, captured 00:34:51 ago<br />

ffffffff ffffffff ffffffff ffffffff 00130400<br />

PDU[3] : len 19, captured 00:34:51 ago<br />

ffffffff ffffffff ffffffff ffffffff 00130400<br />

PDU[4] : len 19, captured 00:34:22 ago<br />

ffffffff ffffffff ffffffff ffffffff 00130400<br />

[. . .]<br />

Outgoing packet capture enabled for BGP neighbor 20.20.20.2<br />

Available buffer size 40958758, 27 packet(s) captured using 562 bytes<br />

PDU[1] : len 41, captured 00:34:52 ago<br />

ffffffff ffffffff ffffffff ffffffff 00290104 000100b4 14141401 0c020a01 04000100<br />

01020080<br />

00000000<br />

PDU[2] : len 19, captured 00:34:51 ago<br />

ffffffff ffffffff ffffffff ffffffff 00130400<br />

PDU[3] : len 19, captured 00:34:50 ago<br />

ffffffff ffffffff ffffffff ffffffff 00130400<br />

PDU[4] : len 19, captured 00:34:20 ago<br />

ffffffff ffffffff ffffffff ffffffff 00130400<br />

[. . .]<br />

The buffers storing the PDU free memory when:<br />

• BGP is disabled<br />

FTOS Configuration Guide, version <strong>7.8.1.0</strong> 257

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