OSPF DATABASE LSA Flag Field

Just in case anyone needs it.

R1#debug ip ospf adj

23:42:08.259: OSPF: Send DBD to 2.2.2.2 on Ethernet0/0 seq u opt 0x52 flag
0x7 len 32

23:42:08.339: OSPF: Rcv DBD from 2.2.2.2 on Ethernet0/0 seq 0x836 opt 0x52
flag 0x7 len 32

mtu 1500 state EXSTART

23:42:08.339: OSPF: NBR Negotiation Done. We are the SLAVE

BRKRST-3018 ) 2009 Cisco Systems, Inc. All rights reserved. Cisco Public 46

R2#debug ip ospf adj

23:42:08.423: OSPF: Send DBD to 1.1.1.1 on Ethernet0/0 seq 0x836 opt 0x52
flag 0x7 len 32

23:42:08.423: OSPF: First DBD and we are not SLAVE

23:42:08.511: OSPF: Rcv DBD from 1.1.1.1 on Ethernet0/0 seq 0x836 opt 0x52
flag 0x2 len 52

mtu 1500 state EXSTART

23:42:08.511: OSPF: NBR Negotiation Done. We are the MASTER

OSPF: Send DBD to 1.1.1.1 on Ethernet0/0 seq 0x836 opt 0x52 flag 0x7

len 32

Flag 0x7--> 111 means I(Initial) = 1, M = 1(More), MS = 1(Master)

Flag 0x6 --> 110 not possible

Flag 0x5 --> 101 not possible

Flag 0x4 --> 100 not possible

Flag 0x3 --> 011 means master has more data to send

Flag 0x2 --> 010 means slave has more data to send

Flag 0x1 --> 001 means master has no more data left to send

Flag 0x0 --> 000 means slave has no more data left to send

Darby

http://www.darbyslogs.blogspot.com

--
Darby Weaver
Network Engineer
darbyweaver_at_yahoo.com
Blogs and organic groups at http://www.ccie.net