3Com 4500 PWR 26-Port Configuration Manual page 297

Split horizon cannot be disabled on a point-to-point link.
Configuring RIP-1 packet zero field check
Follow these steps to configure RIP-1 packet zero field check:
To do...
Enter system view
Enter RIP view
Enable the check of the must be zero
field in RIP-1 packets
Some fields in a RIP-1 packet must be 0, and they are known as must be zero field. For RIP-1, the
must be zero field is checked for incoming packets, and those RIP-1 packets with this field being
nonzero will not be processed.
Setting RIP-2 packet authentication mode
RIP-2 supports two authentication modes: simple authentication and message digest 5 (MD5)
authentication.
Simple authentication cannot provide complete security, because the authentication keys sent along
with packets that are not encrypted. Therefore, simple authentication cannot be applied where high
security is required.
Follow these steps to set RIP-2 packet authentication mode:
To do...
Enter system view
Enter interface
view
Set RIP-2 packet
authentication
mode
system-view
rip
checkzero
Use the command...
system-view
interface interface-type
interface-number
rip authentication-mode
{ simple password | md5
{ rfc2082 key-string key-id |
rfc2453 key-string } }
23-9
Use the command...
—
—
Required
If you specify to use MD5 authentication, you
must specify one of the following MD5
authentication types:
rfc2453 (this type supports the packet format
defined in RFC 2453)
rfc2082 (this type supports the packet format
defined in RFC 2082)
Remarks
—
—
Required
Enabled by default
Remarks