Trip - 3Com MSR 50 Series Configuration Manual

Figure 297 RIP-2 Authentication Message
0
Command
Authentication Type: 2 represents plain text authentication, while 3 represents
■
MD5.
Authentication: Authentication data, including password information when
■
plain text authentication is adopted or including key ID, MD5 authentication
data length and sequence number when MD5 authentication is adopted.
n
RFC 1723 only defines plain text authentication. For information about MD5
■
authentication, refer to RFC2082 "RIP-2 MD5 Authentication".
With RIPv1, you can configure the authentication mode in interface view.
■
However, the configuration will not take effect because RIPv1 does not support
authentication.

TRIP

Triggered RIP (TRIP), a RIP extension on WAN, is mainly used in dial-up network.
Working mechanism
Routing information is sent in triggered updates rather than periodic broadcasts to
reduce the routing management cost the WAN.
Only when data in the routing table changes or the next hop is unreachable, a
■
routing update message is sent.
Since the periodic update delivery is canceled, an acknowledgement and
■
retransmission mechanism is required to guarantee successful updates
transmission on WAN.
Message types
RIP use three new types of message which are identified by the value of the
Command filed.
Update Request (type value 9): Requests needed routes from the peer.
■
Update Response (type value 10): Contains the routes requested by the peer.
■
Update Acknowledge (type value 11): Acknowledges received Update
■
Response messages.
TRIP retransmission mechanism
If receiving no Update Responses after sending an Update Request, a router
■
sends the request again after a specified interval. If still receiving no Update
Response after the upper limit for sending requests is reached, the router
considers the neighbor unreachable.
If receiving no Update Acknowledge after sending an Update Response, a
■
router sends the Update Response again after a specified interval. If still
7 15
Version
0xFFFF
Authentication (16 octets)
RIP Overview 975
Unused
Authentication type
31