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270 | Border Gateway Protocol IPv4 (BGPv4)
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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 max,
might cause captured PDUs to be freed to set the new limit.
Use the command
capture bgp-pdu max-buffer-size (Figure 10-35) to change the maximum buffer size.
View the captured PDUs using the command
show capture bgp-pdu neighbor.
Figure 10-35. Viewing Captured PDUs
The buffers storing the PDU free memory when:
• BGP is disabled
• A neighbor is unconfigured
•
clear ip bgp 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 upon the buffer space
consumed and the new limit.)
Note: Memory on RP1 is not pre-allocated, and is allocated only when a PDU needs to be captured.
FTOS#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
[. . .]