lab 3 EIGRP Route Summarization

EIGRP Route Summarization: Manual

• Summarization is configurable on a per-interface basis in any router within a network.

• When summarization is configured on an interface, the router immediately creates a route pointing to null0.

  –Loop-prevention mechanism

• When the last specific route of the summary goes away, the summary is deleted.

• The minimum metric of the specific routes is used as the metric of the summary route.

Configuring Manual Route Summarization

(config-if)#
ip summary-address eigrp as-number address mask [admin-distance]

• Creates a summary address that this interface will generate

 

基本网络配置

 

 

R1#
interface Loopback0
 ip address 172.16.1.1 255.255.255.0

interface FastEthernet0/0
 ip address 10.1.1.1 255.255.255.0

router eigrp 100
 network 10.1.1.1 0.0.0.0
 network 172.16.1.1 0.0.0.0

R2#
interface Loopback0
 ip address 172.16.2.1 255.255.255.0

interface FastEthernet0/0
 ip address 10.1.1.2 255.255.255.0

router eigrp 100
 network 10.1.1.2 0.0.0.0
 network 172.16.2.1 0.0.0.0

R3#
interface Loopback0
 ip address 172.16.3.1 255.255.255.0

interface FastEthernet0/0
 ip address 202.100.1.3 255.255.255.0

interface FastEthernet1/0
 ip address 10.1.1.3 255.255.255.0

router eigrp 100
 network 10.1.1.3 0.0.0.0
 network 172.16.3.1 0.0.0.0
 network 202.100.1.3 0.0.0.0

#R4#
interface FastEthernet0/0
 ip address 202.100.1.4 255.255.255.0

router eigrp 100
 network 202.100.1.4 0.0.0.0

 

 

 

 

Configuring Manual Route Summarization配置

R3#
interface FastEthernet0/0
 ip address 202.100.1.3 255.255.255.0
 

ip summary-address eigrp 100 172.16.0.0 255.255.0.0

 

 

验证

R3#show ip route 
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is not set

      10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        10.1.1.0/24 is directly connected, FastEthernet1/0
L        10.1.1.3/32 is directly connected, FastEthernet1/0
      172.16.0.0/16 is variably subnetted, 5 subnets, 3 masks

D 172.16.0.0/16 is a summary, 00:00:11, Null0

D        172.16.1.0/24 [90/156160] via 10.1.1.1, 00:08:59, FastEthernet1/0
D        172.16.2.0/24 [90/156160] via 10.1.1.2, 00:08:59, FastEthernet1/0
C        172.16.3.0/24 is directly connected, Loopback0
L        172.16.3.1/32 is directly connected, Loopback0
      202.100.1.0/24 is variably subnetted, 2 subnets, 2 masks
C        202.100.1.0/24 is directly connected, FastEthernet0/0
L        202.100.1.3/32 is directly connected, FastEthernet0/0

 

R4#show ip route 
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is not set

      10.0.0.0/24 is subnetted, 1 subnets
D        10.1.1.0 [90/30720] via 202.100.1.3, 00:09:41, FastEthernet0/0

D 172.16.0.0/16 [90/156160] via 202.100.1.3, 00:02:03, FastEthernet0/0

      202.100.1.0/24 is variably subnetted, 2 subnets, 2 masks
C        202.100.1.0/24 is directly connected, FastEthernet0/0
L        202.100.1.4/32 is directly connected, FastEthernet0/0

 

来自为知笔记(Wiz)