From: Ken.Farrington@barclayscapital.com
Date: Sun Sep 28 2003 - 17:23:20 GMT-3
Hi guys,
Just set up a trace of the bgp session between two routers with one with the
remove-private-as set on.
Intresstingly enuff, when you set this, and some of the routes match the
criteria for striping off the private-as, ( I had three routes ), these
routing updates to the neighbor are sent in a SEPERATE BGP update packet
from all the other bgp routes.
Just thought i'd let you know this. :)
Frame 308 (110 on wire, 110 captured)
Arrival Time: Sep 28, 2003 21:12:15.448486000
Time delta from previous packet: 4.173858000 seconds
Time relative to first packet: 79.627968000 seconds
Frame Number: 308
Packet Length: 110 bytes
Capture Length: 110 bytes
Ethernet II
Destination: 00:10:f6:a8:18:00 (00:10:f6:a8:18:00)
Source: 00:00:0c:5c:b7:19 (00:00:0c:5c:b7:19)
Type: IP (0x0800)
Internet Protocol, Src Addr: 142.220.100.1 (142.220.100.1), Dst Addr:
142.220.100.200 (142.220.100.200)
Version: 4
Header length: 20 bytes
Differentiated Services Field: 0xc0 (DSCP 0x30: Class Selector 6; ECN:
0x00)
1100 00.. = Differentiated Services Codepoint: Class Selector 6
(0x30)
.... ..0. = ECN-Capable Transport (ECT): 0
.... ...0 = ECN-CE: 0
Total Length: 96
Identification: 0x0006
Flags: 0x00
.0.. = Don't fragment: Not set
..0. = More fragments: Not set
Fragment offset: 0
Time to live: 1
Protocol: TCP (0x06)
Header checksum: 0xfba3 (correct)
Source: 142.220.100.1 (142.220.100.1)
Destination: 142.221:22 28/09/200320.100.200 (142.220.100.200)
Transmission Control Protocol, Src Port: 11014 (11014), Dst Port: 179 (179),
Seq: 2560793303, Ack: 196392832, Len: 56
Source port: 11014 (11014)
Destination port: 179 (179)
Sequence number: 2560793303
Next sequence number: 2560793359
Acknowledgement number: 196392832
Header length: 20 bytes
Flags: 0x0018 (PSH, ACK)
0... .... = Congestion Window Reduced (CWR): Not set
.0.. .... = ECN-Echo: Not set
..0. .... = Urgent: Not set
...1 .... = Acknowledgment: Set
.... 1... = Push: Set
.... .0.. = Reset: Not set
.... ..0. = Syn: Not set
.... ...0 = Fin: Not set
Window size: 16282
Checksum: 0xb912 (correct)
Border Gateway Protocol
UPDATE Message
Marker: 16 bytes
Length: 56 bytes
Type: UPDATE Message (2)
Unfeasible routes length: 0 bytes
Total path attribute length: 18 bytes
Path attributes
ORIGIN: IGP (4 bytes)
Flags: 0x40 (Well-known, Transitive, Complete)
0... .... = Well-known
.1.. .... = Transitive
..0. .... = Complete
...0 .... = Regular length
Type code: ORIGIN (1)
Length: 1 byte
Origin: IGP (0)
AS_PATH: 100 (7 bytes)
Flags: 0x40 (Well-known, Transitive, Complete)
0... .... = Well-known
.1.. .... = Transitive
..0. .... = Complete
...0 .... = Regular length
Type code: AS_PATH (2)
Length: 4 bytes
AS path: 100
AS path segment: 100
Path segment type: AS_SEQUENCE (2)
Path segment length: 1 AS
Path segment value: 100
NEXT_HOP: 142.220.100.1 (7 bytes)
Flags: 0x40 (Well-known, Transitive, Complete)
0... .... = Well-known
.1.. .... = Transitive
..0. .... = Complete
...0 .... = Regular length
Type code: NEXT_HOP (3)
Length: 4 bytes
Next hop: 142.220.100.1
Network layer reachability information: 15 bytes
22.22.22.2/32
55.55.55.0/25
220.0.0.11/32
------------------------------------------------------------------------
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