BR1# sh ip int brief
Interface IP-Address OK? Method Status Protocol
Serial0/0 172.16.1.2 YES NVRAM up up
Serial0/1 unassigned YES NVRAM administratively down down
Serial0/2 unassigned YES NVRAM administratively down down
Serial0/3 unassigned YES NVRAM administratively down down
Loopback0 192.168.1.1 YES NVRAM up up
router eigrp 100
network 172.16.1.0 0.0.0.3
network 192.168.1.0
BR1#sh ip eigrp interfaces
EIGRP-IPv4 Interfaces for AS(100)
Xmit Queue PeerQ Mean Pacing Time Multicast Pending
Interface Peers Un/Reliable Un/Reliable SRTT Un/Reliable Flow Timer Routes
Se0/0 1 0/0 0/0 17 0/16 92 0
Lo0 0 0/0 0/0 0 0/0 0 0
BR1#sh ip eigrp neighbors
EIGRP-IPv4 Neighbors for AS(100)
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 172.16.1.1 Se0/0 12 00:02:35 17 102 0 3
BR1#show ip eigrp interfaces detail
EIGRP-IPv4 Interfaces for AS(100)
Xmit Queue PeerQ Mean Pacing Time Multicast Pending
Interface Peers Un/Reliable Un/Reliable SRTT Un/Reliable Flow Timer Routes
Se0/0 1 0/0 0/0 13 0/16 72 0
Hello-interval is 5, Hold-time is 15
Split-horizon is enabled
Next xmit serial
Packetized sent/expedited: 7/1
Hello's sent/expedited: 140/2
Un/reliable mcasts: 0/0 Un/reliable ucasts: 6/7
Mcast exceptions: 0 CR packets: 0 ACKs suppressed: 0
Retransmissions sent: 0 Out-of-sequence rcvd: 0
Topology-ids on interface - 0
Authentication mode is not set
Lo0 0 0/0 0/0 0 0/0 0 0
Hello-interval is 5, Hold-time is 15
Split-horizon is enabled
Next xmit serial
Packetized sent/expedited: 0/0
Hello's sent/expedited: 0/1
Un/reliable mcasts: 0/0 Un/reliable ucasts: 0/0
Mcast exceptions: 0 CR packets: 0 ACKs suppressed: 0
Retransmissions sent: 0 Out-of-sequence rcvd: 0
Topology-ids on interface - 0
Authentication mode is not set
xxxxxxxxxxxxxxxxxxxxxxxxxxx
BR2#sh ip int brief
Interface IP-Address OK? Method Status Protocol
Ethernet0/0 172.16.2.2 YES NVRAM up up
Ethernet0/1 unassigned YES NVRAM administratively down down
Ethernet0/2 unassigned YES NVRAM administratively down down
Ethernet0/3 unassigned YES NVRAM administratively down down
Loopback0 192.168.2.1 YES NVRAM up up
router eigrp 100
network 172.16.2.0 0.0.0.3
network 192.168.2.0
BR2#sh ip eigrp interfaces
EIGRP-IPv4 Interfaces for AS(10)
Xmit Queue PeerQ Mean Pacing Time Multicast Pending
Interface Peers Un/Reliable Un/Reliable SRTT Un/Reliable Flow Timer Routes
EIGRP-IPv4 Interfaces for AS(100)
Xmit Queue PeerQ Mean Pacing Time Multicast Pending
Interface Peers Un/Reliable Un/Reliable SRTT Un/Reliable Flow Timer Routes
Et0/0 1 0/0 0/0 1279 0/2 6388 0
Lo0 0 0/0 0/0 0 0/0 0 0
BR2#sh ip eigrp neighbors
EIGRP-IPv4 Neighbors for AS(10)
EIGRP-IPv4 Neighbors for AS(100)
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 172.16.2.1 Et0/0 12 00:01:10 1279 5000 0 6
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
BR3#sh ip int brief
Interface IP-Address OK? Method Status Protocol
Serial0/0 172.16.3.2 YES NVRAM up up
Serial0/1 unassigned YES NVRAM administratively down down
Serial0/2 unassigned YES NVRAM administratively down down
Serial0/3 unassigned YES NVRAM administratively down down
Loopback0 192.168.3.1 YES NVRAM up up
router eigrp 100
network 0.0.0.0
eigrp router-id 192.168.3.1
BR3#sh ip eigrp interfaces
EIGRP-IPv4 Interfaces for AS(100)
Xmit Queue PeerQ Mean Pacing Time Multicast Pending
Interface Peers Un/Reliable Un/Reliable SRTT Un/Reliable Flow Timer Routes
Se0/0 1 0/0 0/0 1274 0/16 6364 0
Lo0 0 0/0 0/0 0 0/0 0 0
BR3#sh ip eigrp neighbor
EIGRP-IPv4 Neighbors for AS(100)
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 172.16.3.1 Se0/0 129 00:00:52 1274 5000 0 12
xxxxxxxxxxxxxxxx
HQ#sh ip int brief
Interface IP-Address OK? Method Status Protocol
Ethernet0/0 172.16.2.1 YES NVRAM up up
Ethernet0/1 unassigned YES NVRAM administratively down down
Ethernet0/2 unassigned YES NVRAM administratively down down
Ethernet0/3 unassigned YES NVRAM administratively down down
Serial1/0 172.16.1.1 YES NVRAM up up
Serial1/1 unassigned YES NVRAM administratively down down
Serial1/2 unassigned YES NVRAM administratively down down
Serial1/3 unassigned YES NVRAM administratively down down
Serial2/0 172.16.3.1 YES NVRAM up up
Serial2/1 unassigned YES NVRAM administratively down down
Serial2/2 unassigned YES NVRAM administratively down down
Serial2/3 unassigned YES NVRAM administratively down down
Loopback0 192.168.0.1 YES NVRAM up up
HQ# sh ip protocols
*** IP Routing is NSF aware ***
Routing Protocol is "eigrp 100"
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-IPv4 Protocol for AS(100)
Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
NSF-aware route hold timer is 240
Router-ID: 192.168.0.1
Topology : 0 (base)
Active Timer: 3 min
Distance: internal 90 external 170
Maximum path: 4
Maximum hopcount 100
Maximum metric variance 1
Automatic Summarization: disabled
Maximum path: 4
Routing for Networks:
0.0.0.0
Routing Information Sources:
Gateway Distance Last Update
172.16.2.2 90 00:02:57
172.16.3.2 90 00:02:57
172.16.1.2 90 00:02:57
Distance: internal 90 external 170
HQ#show ip eigrp interfaces
EIGRP-IPv4 Interfaces for AS(100)
Xmit Queue PeerQ Mean Pacing Time Multicast Pending
Interface Peers Un/Reliable Un/Reliable SRTT Un/Reliable Flow Timer Routes
Et0/0 1 0/0 0/0 3 0/2 50 0
Se1/0 1 0/0 0/0 12 0/16 68 0
Se2/0 1 0/0 0/0 15 0/15 71 0
Lo0 0 0/0 0/0 0 0/0 0 0
The output of the show ip eigrp interfaces command shows you the working interfaces on which EIGRP is enabled. Notice that Loopback 0 does not peer with any router. In other words, on the Loopback 0 interface, EIGRP packets will not be received. The same would be true for a LAN interface on which there are no additional routers attached. To preserve some resources and instruct routers to stop sending and receiving packets on the specific interface, you can configure such interfaces as passive.
HQ(config)#router eigrp 100
HQ(config-router)#passive-interface default
HQ(config-router)#
*Aug 23 04:03:51.232: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 172.16.3.2 (Serial2/0) is down: interface passive
*Aug 23 04:03:51.233: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 172.16.1.2 (Serial1/0) is down: interface passive
*Aug 23 04:03:51.234: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 172.16.2.2 (Ethernet0/0) is down: interface passive
HQ(config-router)#
HQ(config-router)#no passive-interface ethernet 0/0
HQ(config-router)#
*Aug 23 04:04:27.860: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 172.16.2.2 (Ethernet0/0) is up: new adjacency
HQ(config-router)#no passive-interface serial 1/0
HQ(config-router)#
*Aug 23 04:04:38.754: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 172.16.1.2 (Serial1/0) is up: new adjacency
HQ(config-router)#no passive-interface serial 2/0
HQ(config-router)#
*Aug 23 04:04:45.865: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 172.16.3.2 (Serial2/0) is up: new adjacency
HQ(config-router)#
HQ#show ip protocols
*** IP Routing is NSF aware ***
Routing Protocol is "eigrp 100"
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-IPv4 Protocol for AS(100)
Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
NSF-aware route hold timer is 240
Router-ID: 192.168.0.1
Topology : 0 (base)
Active Timer: 3 min
Distance: internal 90 external 170
Maximum path: 4
Maximum hopcount 100
Maximum metric variance 1
Automatic Summarization: disabled
Maximum path: 4
Routing for Networks:
0.0.0.0
Passive Interface(s):
Passive Interface(s):
Loopback0
Routing Information Sources:
Gateway Distance Last Update
172.16.2.2 90 00:00:27
172.16.3.2 90 00:00:27
172.16.1.2 90 00:00:27
Distance: internal 90 external 170
HQ#sh ip eigrp int
EIGRP-IPv4 Interfaces for AS(100)
Xmit Queue PeerQ Mean Pacing Time Multicast Pending
Interface Peers Un/Reliable Un/Reliable SRTT Un/Reliable Flow Timer Routes
Et0/0 1 0/0 0/0 8 0/2 50 0
Se1/0 1 0/0 0/0 16 0/15 87 0
Se2/0 1 0/0 0/0 1228 0/15 6143
BR1#debug eigrp packets hello
(HELLO)
EIGRP Packet debugging is on
BR1#
*Aug 23 04:06:28.894: EIGRP: Received HELLO on Serial0/0 nbr 172.16.1.1
*Aug 23 04:06:28.894: AS 100, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
BR1#
*Aug 23 04:06:32.259: EIGRP: Sending HELLO on Serial0/0
*Aug 23 04:06:32.259: AS 100, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
BR1#
*Aug 23 04:06:33.410: EIGRP: Received HELLO on Serial0/0 nbr 172.16.1.1
*Aug 23 04:06:33.410: AS 100, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
BR1#
*Aug 23 04:06:36.735: EIGRP: Sending HELLO on Serial0/0
*Aug 23 04:06:36.735: AS 100, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Aug 23 04:06:37.714: EIGRP: Received HELLO on Serial0/0 nbr 172.16.1.1
*Aug 23 04:06:37.714: AS 100, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
BR1#
HQ#show ip eigrp interface detail
EIGRP-IPv4 Interfaces for AS(100)
Xmit Queue PeerQ Mean Pacing Time Multicast Pending
Interface Peers Un/Reliable Un/Reliable SRTT Un/Reliable Flow Timer Routes
Et0/0 1 0/0 0/0 8 0/2 50 0
Hello-interval is 5, Hold-time is 15
Se1/0 1 0/0 0/0 16 0/15 87 0
Hello-interval is 5, Hold-time is 15
Se2/0 1 0/0 0/0 1228 0/15 6143 0
Hello-interval is 60, Hold-time is 180
BR1#debug eigrp packets hello
HQ(config)#int serial 1/0
HQ(config-if)#shu
HQ(config-if)#shutdown
HQ(config-if)#
*Aug 23 04:09:37.990: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 172.16.1.2 (Serial1/0) is down: interface down
HQ(config-if)#
BR1#
*Aug 23 04:09:38.384: EIGRP: Sending HELLO on Serial0/0
*Aug 23 04:09:38.384: AS 100, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
BR1#
*Aug 23 04:09:43.122: EIGRP: Sending HELLO on Serial0/0
*Aug 23 04:09:43.122: AS 100, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
BR1#
*Aug 23 04:09:47.730: EIGRP: Sending HELLO on Serial0/0
*Aug 23 04:09:47.730: AS 100, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
BR1#
*Aug 23 04:09:50.705: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 172.16.1.1 (Serial0/0) is down: holding time expired
BR1#
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