3com MSR 20-20 참조 매뉴얼

ah authentication-algorithm { md5 | sha1 }

IPSec proposal view

md5: Uses MD5.

sha1: Uses SHA1.

Use the ah authentication-algorithm command to specify the authentication 
algorithm for the authentication header (AH) protocol.

Use the undo ah authentication-algorithm command to restore the default.

By default, MD5 is used.

Note that you need to use the transform command to specify the security 
protocol as AH or both AH and ESP before specifying the authentication algorithm 
for AH.

ipsec proposal and transform.

# Configure IPSec proposal prop1 to use AH and SHA1.

<Sysname> system-view

[Sysname] ipsec proposal prop1

[Sysname-ipsec-proposal-prop1] transform ah

[Sysname-ipsec-proposal-prop1] ah authentication-algorithm sha1 

System view