Sorry,permit me to resend this email,because I realize I have used a wrong version which might cause someone not to recognize it.


Hi,a question is just as follows:
When a router receives a LSU packet and compares a LSA from the LSU with the LSA in the LSDB,the newer LSA will be installed in the LSDB.But in the protocol RFC2328,section 13.1 introduces the comparing algorithm,which can determine which LSA is newer.After the comparing,the router should know which LSA is newer and decide to install it.But in section 13.2,the protocol again claims that before the LSA is installed in the LSDB,the router should compare it with the old one in LSDB again,and some comparing contents also come up,which is different from the previous one.
My question is why should the router comparing the LSAs twice?which comparing is needed,and which one is not needed,or both are needed?
Hoping to receive your comments

Best Regards

Xingang Liang
Standardization Department
Mobile Communication R&D Center
China Academy of Telecommunication Technology(CATT)
No.40,Xueyuan Road
Beijing,China
100083
Tel:+8610 62304422EXT225
Fax:+8610 62303127
Mailto:liangxgcatt.ac.cn
 
 

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