Route summarization

Ingore the networks between routers, what is the summarized route pointing back from HQ to A, B and C ?
What is the static route required in HQ router ?

Thx
Diagram1.png
AXISHKAsked:
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Niten KumarConnect With a Mentor Principal Systems AdministratorCommented:
Now if you had a setup as shown below then you could use a summarized route because the exit to all 3 networks is through one interface on HQ router to A which has all 3 networks directly connected.  Diagram1.png
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Don JohnstonInstructorCommented:
Without knowing what networks are at HQ, it's impossible to say.  But since HQ is also connected to the internet, typically a default route would be advertised to the remotes.
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Niten KumarPrincipal Systems AdministratorCommented:
Best would be setup a routing protocol such as OSPF between the HQ router and A, B and C.  If you want static routes then you will need 3 of them as follows:

ip route 172.16.10.0 255.255.255.0 next-hop address or exit interface

ip route 172.16.20.0 255.255.255.0 next-hop address or exit interface

ip route 172.16.30.0 255.255.255.0 next-hop address or exit interface
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AXISHKAuthor Commented:
In case I use RIP, can I configure the summarized route as 172.16.10.0 /19 ?

Thx
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Niten KumarPrincipal Systems AdministratorCommented:
No you can't summarize here because your router has to distinguish between the exit interfaces for each network.
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AXISHKAuthor Commented:
Thx. But the question is asking  " what is the summarized route pointing back from HQ to A, B and C"

I just wonder why it is asking the network command under the RIP or OSPF ....
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AXISHKAuthor Commented:
"what is the summarized route pointing back from HQ to A, B and C "...

So, static route will be the solution and we can use summarization in this case, correct ?

Thx again.
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Don JohnstonConnect With a Mentor InstructorCommented:
Given your diagram, there is no summarized route that can be installed on the HQ router. PERIOD.

The same applies to the remote sites as well.
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Niten KumarPrincipal Systems AdministratorCommented:
Yes you will need to setup 3 static routes on the HQ router as I stated earlier.  You cannot do any summarization in your setup.  Better option would be to use OSPF routing protocol between HQ and A,B and C.

The following static routes should go on the HQ router:

ip route 172.16.10.0 255.255.255.0 next-hop address or exit interface

ip route 172.16.20.0 255.255.255.0 next-hop address or exit interface

ip route 172.16.30.0 255.255.255.0 next-hop address or exit interface
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