olsrv2TibRouterTopologySetSeqNo

This is the greatest Advertised Neighbor Sequence
Number (ANSN) in any TC message
received that originated from the router
with originator address TR_from_orig_addr,
i.e., that contributed to the information
contained in this Tuple and that is defined by the
objects:
   (olsrv2TibRouterTopologySetFromOrigIpAddrType,
    olsrv2TibRouterTopologySetFromOrigIpAddr).
              
Sequence numbers are used in the OLSRv2 protocol
for the purpose of discarding 'old' information,
i.e., messages received out of order.  However,
with a limited number of bits for representing
sequence numbers, wraparound (that the sequence
number is incremented from the maximum possible
value to zero) will occur.  To prevent this from
interfering with the operation of this protocol,
OLSRv2 implementations observe the following when
determining the ordering of sequence numbers.
              
In OLSRv2, MAXVALUE designates one more than the
largest possible value for a sequence number.
For a 16-bit sequence number, MAXVALUE is 65536.
              
The sequence number S1 is said to be 'greater than'
the sequence number S2 if:
              
   o  S1 > S2 AND S1 - S2 < MAXVALUE/2 OR
              
   o  S2 > S1 AND S2 - S1 > MAXVALUE/2
              
When sequence numbers S1 and S2 differ by MAXVALUE/2,
their ordering cannot be determined.  In this case,
which should not occur, either ordering may be
assumed.
              
Thus, when comparing two messages, it is possible
- even in the presence of wraparound - to determine
which message contains the most recent information.

MIB

OLSRv2-MIB

OID

.1.3.6.1.2.1.219.1.2.8.1.5

Type

column

Access

readonly

Status

current

Parent

olsrv2TibRouterTopologySetEntry

Table

olsrv2TibRouterTopologySetTable

Siblings

6