Dell S4048T, Руководство по настройке

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Capturing PDUs
To capture incoming and outgoing PDUs on a per-peer basis, use the
capture bgp-pdu neighbor
direction
command. To disable capturing, use the
no capture bgp-pdu neighbor direction
command.
The buffer size supports a maximum value between 40 MB (the default) and 100 MB. The capture buffers are
cyclic and reaching the limit prompts the system to overwrite the oldest PDUs when new ones are received
for a given neighbor or direction. Setting the buffer size to a value lower than the current maximum, might
cause captured PDUs to be freed to set the new limit.
NOTE: Memory on RP1 is not pre-allocated and is allocated only when a PDU needs to be captured.
The buffers storing the PDU free memory when:
• BGP is disabled.
• A neighbor is unconfigured.
• The
clear ip bgp
command is issued.
• New PDU are captured and there is no more space to store them.
• The max buffer size is reduced. (This may cause PDUs to be cleared depending on the buffer space
consumed and the new limit.)
Examples of the
show capture bgp-pdu neighbor
Command
To change the maximum buffer size, use the
capture bgp-pdu max-buffer-size
command. To view the
captured PDUs, use the
show capture bgp-pdu neighbor
command.
Dell#show capture bgp-pdu neighbor 20.20.20.2
Incoming packet capture enabled for BGP neighbor 20.20.20.2
Available buffer size 40958758, 26 packet(s) captured using 680 bytes
PDU[1] : len 101, captured 00:34:51 ago
ffffffff ffffffff ffffffff ffffffff 00650100 00000013 00000000 00000000
419ef06c 00000000
00000000 00000000 00000000 00000000 0181a1e4 0181a25c 41af92c0 00000000
00000000 00000000
00000000 00000001 0181a1e4 0181a25c 41af9400 00000000
PDU[2] : len 19, captured 00:34:51 ago
ffffffff ffffffff ffffffff ffffffff 00130400
PDU[3] : len 19, captured 00:34:51 ago
ffffffff ffffffff ffffffff ffffffff 00130400
PDU[4] : len 19, captured 00:34:22 ago
ffffffff ffffffff ffffffff ffffffff 00130400
[. . .]
Outgoing packet capture enabled for BGP neighbor 20.20.20.2
Available buffer size 40958758, 27 packet(s) captured using 562 bytes
PDU[1] : len 41, captured 00:34:52 ago
ffffffff ffffffff ffffffff ffffffff 00290104 000100b4 14141401 0c020a01
04000100 01020080
00000000
PDU[2] : len 19, captured 00:34:51 ago
ffffffff ffffffff ffffffff ffffffff 00130400
PDU[3] : len 19, captured 00:34:50 ago
ffffffff ffffffff ffffffff ffffffff 00130400
PDU[4] : len 19, captured 00:34:20 ago
ffffffff ffffffff ffffffff ffffffff 00130400
[. . .]
Border Gateway Protocol IPv4 (BGPv4) 266