Saturday, 1 February 2020

Summarization


Then given situation is to reduce the routing table size and memory. We can achieve this by summarization. Now lets summarize the BB2 all loopback address.

BB2#sh ip interface brief
Interface                  IP-Address      OK? Method Status      Protocol
FastEthernet0/0            155.1.42.2      YES NVRAM  up        up 
Loopback0                  222.1.1.1       YES NVRAM  up             up 
Loopback1                  222.1.2.1       YES NVRAM  up             up 
Loopback2                  222.1.3.1       YES NVRAM  up             up 
Loopback3                  222.1.4.1       YES NVRAM  up             up 
Loopback4                  222.1.5.1       YES NVRAM  up             up 
R6#sh ip route
D    222.1.3.0/24 [90/2302976] via 155.1.156.1, 00:00:11, FastEthernet0/0
D    222.1.2.0/24 [90/2302976] via 155.1.156.1, 00:00:11, FastEthernet0/0
D    222.1.1.0/24 [90/2302976] via 155.1.156.1, 00:00:11, FastEthernet0/0
D    222.1.5.0/24 [90/2302976] via 155.1.156.1, 00:00:11, FastEthernet0/0
D    222.1.4.0/24 [90/2302976] via 155.1.156.1, 00:00:11, FastEthernet0/0
By seeing the ip address we can easily tell that it’s a block of 8.Hence the summary address will be 222.1.0.0 255.255.248.0.
Lets configure this summarization address to BB2

BB2#sh run int fa0/0
interface FastEthernet0/0
 ip address 155.1.42.2 255.255.255.0
 ip summary-address eigrp 100 222.1.0.0 255.255.248.0 5
 duplex auto
 speed auto
end
R6#sh ip route | in 222.1.0.0/21
D    222.1.0.0/21 [90/2302976] via 155.1.156.1, 00:03:30, FastEthernet0/0

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