Hi,
It belive router A will use static route all the time.
if s1 link goes down then 10.50.0.0 will be
unreachable because static route has less
administrative distance and you are not redistributing
static in EIGRP.
Malay Patel
--- "Thomas N." wrote:
> Hi All,
>
> I ran into a scenario below and I am not sure what
> path router A will choose
> to reach the destination network, 10.50.0.0 /
> 255.255.0.0, on router B.
>
> 10.1.1.1 / 255.255.0.0
> |
> ----------S0- Router A-S1-------------
> |
> |
> |
> |
> |
> |
> |
> |
> ----------S0-Router B- S1--------------
> |
> E0 = 10.50.1.1 / 255.255.0.0
>
>
---------------------------------------------------------------
> Router A configuration:
> Interface serial 0
> ip address 172.16.1.1 255.255.255.0
> no shut
>
> Interface Serial 1
> ip address 172.16.2.1 255.255.255.0
> no shut
>
> Interface Ethernet 0
> ip address 10.1.1.1 255.255.0.0
>
> EIGRP 200
> network 172.16.1.0
> network 10.0.0.0
> no auto-summary
>
> ip classless
> ip route 10.48.0.0 255.224.0.0 serial 1
>
----------------------------------------------------------------
> Router B configuration
> Interface serial 0
> ip address 172.16.1.2 255.255.255.0
> no shut
>
> Interface Serial 1
> ip address 172.16.2.2 255.255.255.0
> no shut
>
> Interface Ethernet 0
> ip address 10.50.1.1 255.255.0.0
> no shut
>
> EIGRP 200
> network 172.16.1.0
> network 172.16.2.0
> network 10.0.0.0
> no auto-summary
>
----------------------------------------------------------
>
> In this scenario, I assume router B knows how to
> reach 10.1.1.1 using both
> serial ports with EIGRP (administrative distance =
> 90). Router A has two
> paths to reach 10.50.1.1 destination: 1st path is
> learned through EIGRP
> with administrative distance of 90; the 2nd path is
> with the static route
> with network 10.48.0.0 and subnet mask of
> 255.224.0.0 or 12 bits. If I am
> not wrong, 10.48.0.0 / 255.224.0.0 will cover a
> range of IP addresses from
> 10.48.0.0 to 10.63.255.255; therefore, 10.50.1.1
> falls into this scope.
>
> If I do the "show ip route", I will see both routes
> 10.50.0.0 / 16 and
> 10.48.0.0 / 12.
>
> My questions are:
>
> 1. With those 2 paths to reach 10.50.1.1, which
> path Router A will choose
> as a primary path?
> 2. If the path between 2 serial 0 of the 2 routers
> is down, Can router A
> reach 10.50.1.1 on router B with such a static
> route?
>
> Thanks All!
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