sh ip route ...????

Answered Question

218.248.248.0/24 is variably subnetted, 35 subnets, 2 masks

O 218.248.248.208/30 [110/8] via 218.248.249.34, 01:44:40, POS12/1

C 218.248.248.192/30 is directly connected, POS3/0/1

C 218.248.248.193/32 is directly connected, POS3/0/1

O 218.248.248.196/30 [110/8] via 218.248.248.193, 01:44:40, POS3/0/1

O 218.248.248.240/30 [110/8] via 218.248.249.46, 01:44:40, POS12/2

O 218.248.248.224/30 [110/12] via 218.248.249.1, 01:44:40, POS3/1/0

[110/12] via 218.248.249.38, 01:44:40, POS12/0

O 218.248.248.144/30 [110/12] via 218.248.249.1, 01:44:40, POS3/1/0

[110/12] via 218.248.249.38, 01:44:40, POS12/0

O 218.248.248.136/30 [110/8] via 218.248.249.38, 01:44:40, POS12/0

O 218.248.248.140/30 [110/12] via 218.248.249.1, 01:44:40, POS3/1/0

[110/12] via 218.248.249.38, 01:44:40, POS12/0

O 218.248.248.128/30 [110/16] via 218.248.249.34, 01:44:40, POS12/1

[110/16] via 218.248.249.42, 01:44:40, POS13/0/0

[110/16] via 218.248.249.46, 01:44:40, POS12/2

O 218.248.248.132/30 [110/8] via 218.248.249.1, 01:44:40, POS3/1/0

O 218.248.248.184/30 [110/8] via 218.248.249.1, 01:44:40, POS3/1/0

O 218.248.248.88/30 [110/8] via 218.248.249.34, 01:44:40, POS12/1

O 218.248.248.92/30 [110/8] via 218.248.249.46, 01:44:40, POS12/2

C 218.248.248.72/30 is directly connected, POS3/0/0

C 218.248.248.73/32 is directly connected, POS3/0/0

O 218.248.248.76/30 [110/8] via 218.248.248.73, 01:44:40, POS3/0/0

[110/8] via 218.248.249.46, 01:44:40, POS12/2

O 218.248.248.64/30 [110/8] via 218.248.249.1, 01:44:40, POS3/1/0

--More--

this is the out put of "sh ip route"

do any one help me to get wt it is implies..???(iam having three months experience in networking)

I have this problem too.
0 votes
Correct Answer by smothuku about 9 years 7 months ago

Hi ,

In addition to the above info ,if you consider the following routes taken from routing table

1.218.248.248.0/24 is variably subnetted, 35 subnets, 2 masks

The network conatins class C ip address schema and routing would show 25 routes (subents) and two masks ( /30 and /32)

O 218.248.248.208/30 [110/8] via 218.248.249.34, 01:44:40, POS12/1

it is opsf learned intraarea route and next hop to reach 218.248.248.208/30 is POS12/1 (218.248.249.34)

C 218.248.248.192/30 is directly connected, POS3/0/1

It is directly connected route.

C 218.248.248.193/32 is directly connected, POS3/0/1

it is also directly connected route.

O 218.248.248.196/30 [110/8] via 218.248.248.193, 01:44:40, POS3/0/1

it is opsf learned intra area route.

[110/8] signifies [adiministrative distance / metric].

Administrative distance : it is used to rate the trustworthiness of the routing information.

metric: Used to calculate distance to destiation.

each and every routing protocol has administrative distance value and 120 is for ospf. Ospf metric is cost and it is 8 in this case.

By seeing all the routes we could sya that routers are present in a single area.

Hope this helps you.

Thanks,

satish

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Richard Burts Thu, 02/08/2007 - 07:21

Mahesh

I am not sure what you are looking for, but here are some of the things that I note in the output that you posted:

- the network is using class C network 218.248.248.0.

- the routing table shows a couple of connected interfaces (POS3/0/0 and POS3/0/1) and shows routes learned through some other connected interfaces (POS12/1, POS12/2, POS3/1/0)

- the routing table shows that the dynamic routing protocol being used is OSPF.

- all of the dynamically leaned routes are OSPF intra-area routes (all within the same area). There is not enough information to be sure but it suggests that OSPF has configured only a single area.

If there is something else that you are looking for, then perhaps you can clarify.

HTH

Rick

albert.remo Fri, 02/09/2007 - 00:51

Hi!

Good Day! This is basically your routing table. Codes are usually displayed on the begining of the result of the show IP route command. In your example, you have several networks that are directly connected (represented by C before each line) and OSPF derived routes (represented by O before each line). Each line includes the administrative distance, metrics and next hop address. This table is used by the router in forwarding packets through the network.

It shows that you're running OSPF on your router and most interfaces are POS (Packet over sonet) so this could be a big router, a GSR maybe.

Please see link below for more details about the "show ip route" command.

http://www.cisco.com/en/US/products/sw/iosswrel/ps5187/products_command_reference_chapter09186a008017d02e.html#wp1039689

Hope this helps.

Regards,

Albert

Correct Answer
smothuku Fri, 02/09/2007 - 04:18

Hi ,

In addition to the above info ,if you consider the following routes taken from routing table

1.218.248.248.0/24 is variably subnetted, 35 subnets, 2 masks

The network conatins class C ip address schema and routing would show 25 routes (subents) and two masks ( /30 and /32)

O 218.248.248.208/30 [110/8] via 218.248.249.34, 01:44:40, POS12/1

it is opsf learned intraarea route and next hop to reach 218.248.248.208/30 is POS12/1 (218.248.249.34)

C 218.248.248.192/30 is directly connected, POS3/0/1

It is directly connected route.

C 218.248.248.193/32 is directly connected, POS3/0/1

it is also directly connected route.

O 218.248.248.196/30 [110/8] via 218.248.248.193, 01:44:40, POS3/0/1

it is opsf learned intra area route.

[110/8] signifies [adiministrative distance / metric].

Administrative distance : it is used to rate the trustworthiness of the routing information.

metric: Used to calculate distance to destiation.

each and every routing protocol has administrative distance value and 120 is for ospf. Ospf metric is cost and it is 8 in this case.

By seeing all the routes we could sya that routers are present in a single area.

Hope this helps you.

Thanks,

satish

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