AODV Routing Protocol in NS2

Properties of AODV:

• For each destination, a node should maintain a list of precursor nodes to route through them.
• It utilizes routing tables to store routing information. It maintains both unicast and multicast router table.
• Life-time updated every time the route is used.
• Router table maintain information of destination address, next-hop address, destination sequence number and life time of the node.

Sample code for AODV routing protocol in NS2:

This is code for AODV link failure condition checking.
void
AODV::handle_link_failure(nsaddr_t id) {

aodv_rt_entry *rt, *rtn;
Packet *rerr = Packet::alloc();
struct hdr_aodv_error *re = HDR_AODV_ERROR(rerr);

re->DestCount = 0;
for(rt = rtable.head(); rt; rt = rtn) {
// for each rt entry
rtn = rt->rt_link.le_next;
if ((rt->rt_hops != INFINITY2) && (rt->rt_nexthop == id) ) {

assert (rt->rt_flags == RTF_UP);
assert((rt->rt_seqno%2) == 0);
rt->rt_seqno++;
re->unreachable_dst[re->DestCount] = rt->rt_dst;
re->unreachable_dst_seqno[re->DestCount] = rt->rt_seqno;
#ifdef DEBUG
fprintf(stderr, “%s(%f): %d\t(%d\t%u\t%d)\n”, __FUNCTION__, CURRENT_TIME,
index, re->unreachable_dst[re->DestCount],
re->unreachable_dst_seqno[re->DestCount], rt->rt_nexthop);
#endif // DEBUG
re->DestCount += 1;
rt_down(rt);

}