Tag Archives: 3.3e

3.3.e Implement and troubleshoot passive interface

With most routing protocols, the passive-interface command restricts outgoing advertisements only. But, when used with Enhanced Interior Gateway Routing Protocol (EIGRP), the effect is slightly different. Passive-interface command in EIGRP suppresses the exchange of hello packets between two routers, which results in the loss of their neighbor relationship. This stops not only routing updates from being advertised , but it also suppresses incoming routing updates. OSPF doesn’t send hellos and doesn’t form neighborships over interfaces configured with passive-interface

Adam, Paul (2014-07-12). All-in-One CCIE V5 Written Exam Guide (Kindle Locations 2685-2690).  . Kindle Edition.

http://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/13675-16.html

3.3.e Implement and troubleshoot passive interface

R1(config-router)#passive-interface default
R1(config-router)#
*Mar  2 22:59:30.016: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 192.168.13.3 (FastEthernet1/0) is down: interface passive
*Mar  2 22:59:30.032: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 192.168.15.5 (FastEthernet2/0) is down: interface passive

R1(config-router)#no passive-int f1/
% Incomplete command.

R1(config-router)#no passive-int f1/0
R1(config-router)#
*Mar  2 23:01:30.800: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 192.168.13.3 (FastEthernet1/0) is up: new adjacency
R1(config-router)#no passive-int f2/0
R1(config-router)#
*Mar  2 23:01:38.728: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 192.168.15.5 (FastEthernet2/0) is up: new adjacency

R6(config)#router ospf 1
R6(config-router)#pass defa
R6(config-router)#
*Mar  2 23:03:32.260: %OSPF-5-ADJCHG: Process 1, Nbr 7.7.7.7 on FastEthernet1/0 from FULL to DOWN, Neighbor Down: Interface down or detached
R6(config-router)#no passive-int f1/0
R6(config-router)#
*Mar  2 23:04:02.264: %OSPF-5-ADJCHG: Process 1, Nbr 7.7.7.7 on FastEthernet1/0 from LOADING to FULL, Loading Done