show ip eigrp topologp

MongolNet

Hi all,

I'm at present studying for route. While looking at the "show ip eigrp topology 172.16.0.0/24" command, their is a couple of things that I don't understand. They are:

1. Query origin flag is 1
2. Send flag is 0x0

What do they mean and what do they do.

The full output is:
sh ip eigrp topology 172.16.0.0/24
IP-EIGRP (AS 1): Topology entry for 172.16.0.0/24
State is Passive, Query origin flag is 1, 1 Successor(s), FD is 156160
Routing Descriptor Blocks:
10.0.12.1 (FastEthernet0/0), from 10.0.12.1, Send flag is 0x0
Composite metric is (156160/128256), Route is Internal
Vector metric:
Minimum bandwidth is 100000 Kbit
Total delay is 5100 microseconds
Reliability is 255/255
Load is 1/255
Minimum MTU is 1500
Hop count is 1

Thanks in advance.

Eildor

MongolNet wrote: »

Hi all,

I'm at present studying for route. While looking at the "show ip eigrp topology 172.16.0.0/24" command, their is a couple of things that I don't understand. They are:

1. Query origin flag is 1
2. Send flag is 0x0

What do they mean and what do they do.

The full output is:
sh ip eigrp topology 172.16.0.0/24
IP-EIGRP (AS 1): Topology entry for 172.16.0.0/24
State is Passive, Query origin flag is 1, 1 Successor(s), FD is 156160
Routing Descriptor Blocks:
10.0.12.1 (FastEthernet0/0), from 10.0.12.1, Send flag is 0x0
Composite metric is (156160/128256), Route is Internal
Vector metric:
Minimum bandwidth is 100000 Kbit
Total delay is 5100 microseconds
Reliability is 255/255
Load is 1/255
Minimum MTU is 1500
Hop count is 1

Thanks in advance.

Query origin flag

0: This route is active but no query has been originated for it (we are searching for a feasible successor locally).

1: This router originated the query for this route (or the route is passive).

2: Multiple diffusing computations for this query. This router has received more than one query for this route from more than one source.

3: The router that we learned the path to this network from is querying for another route.

4: Multiple query sources for this route, including the router through which we learned this route. Similar to 2, but it also means there is a query origin string which describes the queries outstanding for this path.

Send flag

0x0: If there are packets that need to be sent in relation to this entry, this indicates the type of packet.

0x1: This router has received a query for this network, and needs to send a unicast reply.

0x2: This route is active, and a multicast query should be sent.

0x3: This route has changed, and a multicast update should be sent.

This information can be found on this white paper.