The leak-map name keyword configures the stub router to advertise selected EIGRP-learned routes which are not ordinarily advertised. The name refers to a route map that matches one or more ACLs or prefix lists and permits the matched subnets or addresses to be leaked.
The EIGRP Stub feature is very useful when we want to
prevent unnecessary EIGRP queries and want to filter a few routes that we
advertise but when we want to configure our EIGRP router as a stub and still we
want to make an exception to some routes (network) to advertise this is
possible with the help of Leak-map.
In summary route-
Whenever we configure our EIGRP summary route, all the networks
within the range of our summary are no longer advertised on interfacing the only
this is left is a summary route, but we want to advertise some networks separately
next to our summary route this can also be done with summary leak-map. Let's see
how to configure the leak map.
Topology: -
Goal:
- Configure the topology as per the diagram.
- Assigning the IP addresses to their interfaces.
- Configure EIGRP 1234 on all the routers.
- Configure EIGRP STUB connected on router 3.
- Configure Leak-Map on router 3 with the exception that network 192.168.32.1 network only advertises to all the routers.
R1(config)#interface serial 4/0
R1(config-if)#ip address 1.1.1.1 255.0.0.0
R1(config-if)#no shutdown
R1(config-if)#exit
R1(config)#interface loopback 0
R1(config-if)#ip address 10.1.1.1 255.0.0.0
R1(config-if)#no shutdown
R1(config-if)#exit
R2(config)#interface serial 4/1
R2(config-if)#ip address 2.2.2.2 255.0.0.0
R2(config-if)#no shutdown
R2(config-if)#exit
R2(config)#interface loopback 0
R2(config-if)#ip address 20.1.1.1 255.0.0.0
R2(config-if)#no shutdown
R2(config-if)#exit
R3(config)#interface serial 4/0
R3(config-if)#ip address 1.1.1.2 255.0.0.0
R3(config-if)#no shutdown
R3(config-if)#exit
R3(config)#interface serial 4/1
R3(config-if)#ip address 2.2.2.1 255.0.0.0
R3(config-if)#no shutdown
R3(config-if)#exit
R3(config)#interface serial 4/2
R3(config-if)#ip address 3.3.3.1 255.0.0.0
R3(config-if)#no shutdown
R3(config-if)#exit
t
R4(config)#interface fastEthernet 2/1
R4(config-if)#ip address 192.168.32.1 255.255.255.0
R4(config-if)#no shutdown
R4(config-if)#no keepalive
R4(config-if)#exit
R4(config)#interface serial 4/2
R4(config-if)#ip address 3.3.3.2 255.0.0.0
R4(config-if)#no shutdown
R4(config-if)#exit
R4(config)#interface fastEthernet 0/0
R4(config-if)#ip address 192.168.30.1 255.255.255.0
R4(config-if)#no shutdown
R4(config-if)#no keepalive
R4(config-if)#exit
R4(config)#interface fastEthernet 2/0
R4(config-if)#ip address 192.168.31.1 255.255.255.0
R4(config-if)#no shutdown
R4(config-if)#no keepalive
R4(config-if)#exit
R1#show ip interface brief
Interface IP-Address OK? Method Status Protocol
Serial4/0 1.1.1.1 YES manual up up
Loopback0 10.1.1.1 YES manual up up
R2#show ip interface brief
Interface IP-Address OK? Method Status Protocol
Serial4/1 2.2.2.2 YES manual up up
Loopback0 20.1.1.1 YES manual up up
R3#show ip interface brief
Interface IP-Address OK? Method Status Protocol
Serial4/0 1.1.1.2 YES manual up up
Serial4/1 2.2.2.1 YES manual up up
Serial4/2 3.3.3.1 YES manual up up
R4#show ip interface brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 192.168.30.1 YES manual up up
FastEthernet2/0 192.168.31.1 YES manual up up
FastEthernet2/1 192.168.32.1 YES manual up up
Serial4/2 3.3.3.2 YES manual up up
R1(config)#router eigrp 1234
R1(config-router)#network 0.0.0.0 255.255.255.255
R1(config-router)#no auto-summary
R1(config-router)#exit
*Jun 2 23:22:30.379: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1234: Neighbor 1.1.1.2 (Serial4/0) is up: new adjacency
R2(config)#router eigrp 1234
R2(config-router)#network 0.0.0.0 255.255.255.255
R2(config-router)#no auto-summary
R2(config-router)#exit
*Jun 2 23:52:39.419: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1234: Neighbor 2.2.2.1 (Serial4/1) is up: new adjacency
R3(config)#router eigrp 1234
R3(config-router)#network 0.0.0.0 255.255.255.255
R3(config-router)#no auto-summary
R3(config-router)#exit
*Jun 2 23:52:43.191: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1234: Neighbor 3.3.3.2 (Serial4/2) is resync: summary configured
*Jun 2 23:52:40.287: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1234: Neighbor 3.3.3.2 (Serial4/2) is up: new adjacency
R4(config)#router eigrp 1234.
R4(config-router)#network 0.0.0.0 255.255.255.255
R4(config-router)#no auto-summary
R4(config-router)#exit
*Jun 3 00:14:00.539: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1234: Neighbor 3.3.3.1 (Serial4/2) is up: new adjacency
R1#show ip route
Codes: 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
Gateway of last resort is not set
C 1.0.0.0/8 is directly connected, Serial4/0
D 2.0.0.0/8 [90/2681856] via 1.1.1.2, 00:04:44, Serial4/0
D 192.168.31.0/24 [90/2684416] via 1.1.1.2, 00:00:14, Serial4/0
D 3.0.0.0/8 [90/2681856] via 1.1.1.2, 00:03:45, Serial4/0
D 192.168.30.0/24 [90/2684416] via 1.1.1.2, 00:00:14, Serial4/0
D 20.0.0.0/8 [90/2809856] via 1.1.1.2, 00:04:43, Serial4/0
C 10.0.0.0/8 is directly connected, Loopback0
D 192.168.32.0/24 [90/2684416] via 1.1.1.2, 00:00:14, Serial4/0
R3(config)#router eigrp 1234
R3(config-router)#eigrp stub ?
connected Do advertise connected routes
leak-map Allow dynamic prefixes based on the leak-map
receive-only Set IP-EIGRP as receive only neighbor
redistributed Do advertise redistributed routes
static Do advertise static routes
summary Do advertise summary routes
<cr>
R3(config-router)#eigrp stub connected
*Jun 3 00:15:23.055: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1234: Neighbor 1.1.1.1 (Serial4/0) is down: peer info changed
*Jun 3 00:15:23.055: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1234: Neighbor 2.2.2.2 (Serial4/1) is down: peer info changed
*Jun 3 00:15:23.063: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1234: Neighbor 3.3.3.2 (Serial4/2) is down: peer info changed
R3(config-router)#
*Jun 3 00:15:26.391: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1234: Neighbor 3.3.3.2 (Serial4/2) is up: new adjacency
*Jun 3 00:15:26.443: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1234: Neighbor 2.2.2.2 (Serial4/1) is up: new adjacency
*Jun 3 00:15:26.955: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1234: Neighbor 1.1.1.1 (Serial4/0) is up: new adjacency
R3(config-router)#exit
R3(config)#router eigrp 1234
R3(config-router)#eigrp stub connected leak
R3(config-router)#eigrp stub connected leak-map Route-Leak
*Jun 3 00:16:53.475: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1234: Neighbor 1.1.1.1 (Serial4/0) is down: peer info changed
*Jun 3 00:16:53.483: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1234: Neighbor 2.2.2.2 (Serial4/1) is down: peer info changed
*Jun 3 00:16:53.487: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1234: Neighbor 3.3.3.2 (Serial4/2) is down: peer info changed
*Jun 3 00:16:54.003: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1234: Neighbor 1.1.1.1 (Serial4/0) is up: new adjacency
R3(config-router)#exit
*Jun 3 00:16:54.783: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1234: Neighbor 2.2.2.2 (Serial4/1) is up: new adjacency
R3(config-router)#exit
R3(config)#route-map Route-Leak
R3(config-route-map)#match ip address 1
R3(config-route-map)#exit
*Jun 3 00:18:07.935: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1234: Neighbor 1.1.1.1 (Serial4/0) is resync: route configuration changed
*Jun 3 00:18:07.935: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1234: Neighbor 2.2.2.2 (Serial4/1) is resync: route configuration changed
*Jun 3 00:18:07.939: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1234: Neighbor 3.3.3.2 (Serial4/2) is resync: route configuration changed
R3(config)#access-list 1 permit 192.168.32.0 0.0.0.255
*Jun 3 00:18:51.583: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1234: Neighbor 1.1.1.1 (Serial4/0) is down: route configuration changed
*Jun 3 00:18:51.599: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1234: Neighbor 2.2.2.2 (Serial4/1) is down: route configuration changed
*Jun 3 00:18:51.603: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1234: Neighbor 3.3.3.2 (Serial4/2) is down: route configuration changed
*Jun 3 00:18:52.079: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1234: Neighbor 2.2.2.2 (Serial4/1) is up: new adjacency
*Jun 3 00:18:52.735: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1234: Neighbor 1.1.1.1 (Serial4/0) is up: new adjacency
*Jun 3 00:18:55.883: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1234: Neighbor 3.3.3.2 (Serial4/2) is up: new adjacency
R1#show ip route
Codes: 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
Gateway of last resort is not set
C 1.0.0.0/8 is directly connected, Serial4/0
D 2.0.0.0/8 [90/2681856] via 1.1.1.2, 00:00:09, Serial4/0
D 3.0.0.0/8 [90/2681856] via 1.1.1.2, 00:00:09, Serial4/0
C 10.0.0.0/8 is directly connected, Loopback0
D 192.168.32.0/24 [90/2684416] via 1.1.1.2, 00:00:08, Serial4/0
R1#ping 192.168.32.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.32.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 20/32/36 ms
R1#traceroute 192.168.32.1
Type escape sequence to abort.
Tracing the route to 192.168.32.1
1 1.1.1.2 8 msec 8 msec 12 msec
2 3.3.3.2 16 msec 12 msec 24 msec
R1#traceroute 192.168.32.1
Type escape sequence to abort.
Tracing the route to 192.168.32.1
1 1.1.1.2 40 msec 20 msec 20 msec
2 3.3.3.2 16 msec 32 msec 40 msec
R2#show ip route
Codes: 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
Gateway of last resort is not set
D 1.0.0.0/8 [90/2681856] via 2.2.2.1, 00:00:19, Serial4/1
C 2.0.0.0/8 is directly connected, Serial4/1
D 3.0.0.0/8 [90/2681856] via 2.2.2.1, 00:00:19, Serial4/1
C 20.0.0.0/8 is directly connected, Loopback0
D 192.168.32.0/24 [90/2684416] via 2.2.2.1, 00:00:16, Serial4/1
R2#ping 192.168.32.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.32.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 16/27/36 ms
R2#ping 192.168.31.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.31.1, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
R3#show ip protocols
Routing Protocol is "eigrp 1234"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Default networks flagged in outgoing updates
Default networks accepted from incoming updates
EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
EIGRP maximum hopcount 100
EIGRP maximum metric variance 1
EIGRP stub, connected, leak-map Route-Leak
Redistributing: eigrp 1234
EIGRP NSF-aware route hold timer is 240s
Automatic network summarization is not in effect
Maximum path: 4
Routing for Networks:
0.0.0.0
Routing Information Sources:
Gateway Distance Last Update
2.2.2.2 90 00:48:15
1.1.1.1 90 00:48:12
3.3.3.2 90 00:48:11
Distance: internal 90 external 170
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