Network Advertisement and Summarization
Posted on 2014-07-19
I have seen in some configuration where they Advertise the Network with a prefix different than the Interface IP mask.
They also summarize the network different than the interface IP mask.
Let's say I have R1 connected to R2 through serial interfaces on each router.
R1 serial interface has Ip address 10.10.10.1/24 and R2 serial interface has ip address 10.10.10.2/24
when Network is advertised in EIGRP for instance, they use the command:
** I believe The Network command above will by default add a mask of /8 , it is like typing 255.0.0.0
which is different than /24 mask of the serial interface.
So what would be the impact in that case?
another scenario is Summarization,example :
Interface serial 1/0
ip summary-address EIGRP 90 10.10.0.0 255.255.0.0
I see the summarization is based on /16 , so how this would impact the /24 configured on the serial interfaces ?