show ip eigrp topologp

MongolNetMongolNet Posts: 2Member ■□□□□□□□□□
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.

Comments

  • EildorEildor Posts: 444Member
    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.
  • MongolNetMongolNet Posts: 2Member ■□□□□□□□□□
    Hi Eildor,

    Thank you for your help

    Alastair
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