EIGRP Passive interface and configuration

Route filtering passive interface

Cisco IOS provides several ways to control updates traffic. Passive interface, distribute list, prefix list route maps. In this section we take look at passive interface in RIPv2, EIGRP, and OSPF.

Passive interface command is used in al routing protocol to disable sending updates out from a specific interface. However the command behavior varies from one protocol to another.

EIGRP Passive interface

EIGRP do not send any hello messages on passive interface. EIGRP router ignores any EIGRP messages received on the interface its means no neighbors relation but EIGRP still advertises about the connected subnet only if matched with an EIGRP network command.

  

lets see the configuration:-

Before we start  EIGRP configuration check out some important  of EIGRP CCIE exam topics.

Here is the lists of all EIGRP labs and theories CCNA to CCIE

1.Enhanced Interior Gateway Routing Protocol (EIGRP)

2.Stuck In Active (EIGRP)

3.EIGRP Equal-Cost and Unequal-Cost load balancing

4.Route filtering passive interface

5.Route summarization

6.EIGRP STUB and Configuration


7.Routing Protocol Authentication (EIGRP ) and configuration

Topology:

Goal:

• configure the topology as per the diagram
•  configure EIGRP 65001 and advertise interface
• configure router 3 interface serial 3/1 passive interface 

• make sure router 3 drop neighbourship and prevent routes

R1#show ip interface brief
Interface              IP-Address      OK? Method Status                Protocol
FastEthernet0/0        10.1.1.1        YES manual up                    up
Serial3/0                    1.1.1.1         YES manual up                    up

 R2#show ip interface brief
Interface              IP-Address      OK? Method Status                Protocol
FastEthernet0/0        20.1.1.1        YES manual up                    up
Serial3/0                     1.1.1.2         YES manual up                    up
Serial3/1                      2.1.1.1         YES manual up                    up

R3#show ip interface brief

Interface              IP-Address      OK? Method Status                Protocol

FastEthernet0/0        30.1.1.1        YES manual up                    up

Serial3/1                     2.1.1.2         YES manual up                    up

R1(config)#router eigrp 65001
R1(config-router)#network 1.0.0.0
R1(config-router)#network 10.0.0.0
R1(config-router)#exit

R2(config)#router eigrp 65001

R2(config-router)#network 20.0.0.0

R2(config-router)#network 2.0.0.0

R2(config-router)#network 1.0.0.0

*Mar 18 13:43:20.971: %DUAL-5-NBRCHANGE: EIGRP-IPv4 65001: Neighbor 1.1.1.1 (Serial3/0) is up: new adjacency

R2(config-router)#end

R3(config)#router eigrp 65001

R3(config-router)#network 2.0.0.0

*Mar 18 13:44:10.655: %DUAL-5-NBRCHANGE: EIGRP-IPv4 65001: Neighbor 2.1.1.1 (Serial3/1) is up: new adjacency

R3(config-router)#network 30.0.0.0

R3(config-router)#end

R1#show ip route eigrp
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

D     2.0.0.0/8 [90/2681856] via 1.1.1.2, 00:03:36, Serial3/0
D     20.0.0.0/8 [90/2172416] via 1.1.1.2, 00:03:36, Serial3/0
D     30.0.0.0/8 [90/2684416] via 1.1.1.2, 00:00:16, Serial3/0

R2#show ip route eigrp

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

D     10.0.0.0/8 [90/2172416] via 1.1.1.1, 00:04:00, Serial3/0

D     30.0.0.0/8 [90/2172416] via 2.1.1.2, 00:00:40, Serial3/1

R3#show ip route eigrp

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

D     1.0.0.0/8 [90/2681856] via 2.1.1.1, 00:00:58, Serial3/1

D     10.0.0.0/8 [90/2684416] via 2.1.1.1, 00:00:58, Serial3/1

D     20.0.0.0/8 [90/2172416] via 2.1.1.1, 00:00:58, Serial3/1

R2#show ip eigrp neighbors
EIGRP-IPv4 Neighbors for AS(65001)
H   Address                 Interface              Hold Uptime   SRTT   RTO  Q  Seq
                                                                      (sec)            (ms)   Cnt Num
1   2.1.1.2                 Se3/1                    14 00:01:19            21   126  0  7
0   1.1.1.1                 Se3/0                    10 00:04:39            27   162  0  6

R2(config)#router eigrp 65001
R2(config-router)#passive-interface serial 3/1

*Mar 18 13:50:02.303: %DUAL-5-NBRCHANGE: EIGRP-IPv4 65001: Neighbor 2.1.1.2 (Serial3/1) is down: interface passive
R2(config-router)#end

R1#show ip route eigrp
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

D     2.0.0.0/8 [90/2681856] via 1.1.1.2, 00:07:22, Serial3/0
D     20.0.0.0/8 [90/2172416] via 1.1.1.2, 00:07:22, Serial3/0

R2#show ip route eigrp

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

D     10.0.0.0/8 [90/2172416] via 1.1.1.1, 00:07:56, Serial3/0

R2#show ip eigrp neighbors

EIGRP-IPv4 Neighbors for AS(65001)

H   Address                 Interface              Hold Uptime   SRTT   RTO  Q  Seq

                                                   (sec)         (ms)       Cnt Num

0   1.1.1.1                 Se3/0                    13 00:08:29   32   192  0  7