Concept Guide

'UPDATE error/Missing well-known attr' Sent : 1 Recv: 0
'Connection Reset' Sent : 1 Recv: 0
Last notification (len 21) sent 00:26:02 ago
ffffffff ffffffff ffffffff ffffffff 00160303 03010000
Last notification (len 21) received 00:26:20 ago
ffffffff ffffffff ffffffff ffffffff 00150306 00000000
Last PDU (len 41) received 00:26:02 ago that caused notification to be issued
ffffffff ffffffff ffffffff ffffffff 00290200 00000e01 02040201 00024003 04141414 0218c0a8
01000000
Local host: 1.1.1.1, Local port: 179
Foreign host: 1.1.1.2, Foreign port: 41758
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 buer size supports a maximum value between 40 MB (the default) and 100 MB. The capture buers 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 buer 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 buers storing the PDU free memory when:
• BGP is disabled.
• A neighbor is uncongured.
• The clear ip bgp command is issued.
• New PDU are captured and there is no more space to store them.
• The max buer size is reduced. (This may cause PDUs to be cleared depending on the buer space consumed and the new limit.)
Examples of the show capture bgp-pdu neighbor Command
To change the maximum buer size, use the capture bgp-pdu max-buffer-size command. To view the captured PDUs, use the
show capture bgp-pdu neighbor command.
DellEMC#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 (BGP)
241