EIGRP: Bandwidth consumption adjustment

The default bandwidth usage percentage by EIGRP is 50%, you can adjust it by issuing ip bandwidth-percent eigrp command on router's interface. 1841-1(config)#int se0/1/0.102 1841-1(config-subif)#ip bandwidth-percent eigrp 25 80 Here I adjusted the bandwidth percentage from default 50% to 80%.

Non-broadcast multi-access network

Hub and spoke connectivity over frame relay (NBMA) 1. Multipoint NBMA allows one subnet to be used by hub and spoke routers. 2. In contrast to multipoint, point to point link is a subnet hence consumes more IP subnets. 3. Communication between spoke routers can be established via hub router. Both the spoke routers … Continue reading Non-broadcast multi-access network →

EIGRP: Unequal cost load balancing

1. Use the variance command. 2. Default variance is 1. 3. Do determine the variance value use the command show ip eigrp topology. Example: 3825-1#sh ip eigrp topo IP-EIGRP Topology Table for AS(90)/ID(192.168.10.1) Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - reply Status, s - … Continue reading EIGRP: Unequal cost load balancing →

EIGRP Metric

Metric formula It is not necessary to know, but it is a good idea for me to understand how the EIGRP metric is derived. Total outgoing minimum bandwidth = (K1 * bandwidth) + (K2 * bandwidth) Where K1 = bandwidth and K2 = load. Cumulative Load, Delay and Reliability calculation =[ (256 - load) + … Continue reading EIGRP Metric →

Route Filtering: EIGRP and RIP mixed protocol lab 1.2

Objective: Configure a route filter at A that will only allow subnets 172.16.2.0/24, 172.16.8.0/24 and 172.16.9.0/24 to be advertised into RIP domain. D#sh ip route rip 172.16.0.0/24 is subnetted, 13 subnets R 172.16.253.0/24 is possibly down, routing via 172.16.252.1, FastEthernet0/0 R 172.16.254.0/24 is possibly down, routing via 172.16.252.1, FastEthernet0/0 R 172.16.251.0/24 is possibly down, routing … Continue reading Route Filtering: EIGRP and RIP mixed protocol lab 1.2 →

Route filtering: EIGRP and RIP mixed protocol lab.

Objective: Configure a route filter at A (R1) that will prevent D (R4) from learning about subnet 172.16.10.0/24 D#sh ip route 172.16.0.0/24 is subnetted, 14 subnets C 172.16.252.0 is directly connected, FastEthernet0/0 R 172.16.253.0 [120/1] via 172.16.252.1, 00:00:13, FastEthernet0/0 R 172.16.254.0 [120/1] via 172.16.252.1, 00:00:13, FastEthernet0/0 R 172.16.251.0 [120/1] via 172.16.252.1, 00:00:13, FastEthernet0/0 R 172.16.8.0 … Continue reading Route filtering: EIGRP and RIP mixed protocol lab. →

EIGRP (NBMA): Summarization, bandwidth utilization and authentication Part 3

Additional objective has been added last minute. For security your boss requires you to enable authentication among EIGRP routers, the keys should be changed at these timing and date: 1. first key phrase: cisco123 Accept from 16 September 2010 10pm to 17 September 2010 12MN. Sent from 16 September 2010 10pm to 12MN 2. second … Continue reading EIGRP (NBMA): Summarization, bandwidth utilization and authentication Part 3 →

EIGRP: Troubleshooting East and West unreachability issue

*Mar 1 16:27:08.231: IP: tableid=0, s=172.30.10.3 (local), d=10.2.3.1 (Serial0/0.1), routed via FIB *Mar 1 16:27:08.231: IP: s=172.30.10.3 (local), d=10.2.3.1 (Serial0/0.1), len 100, sending *Mar 1 16:27:09.077: IP: s=10.3.2.1 (local), d=224.0.0.10 (Loopback2), len 60, sending broad/multicast *Mar 1 16:27:09.077: IP: s=10.3.2.1 (Loopback2), d=224.0.0.10, len 60, rcvd 2. *Mar 1 16:27:09.521: IP: s=10.3.3.1 (local), d=224.0.0.10 (Loopback3), len … Continue reading EIGRP: Troubleshooting East and West unreachability issue →

EIGRP (NMBA-Multipoint frame-relay): Configure routing part 2

1. Use EIGRP autonomous system number 100 to form route among 3 branch offices. New networks added to West office: West#sh ip route Gateway of last resort is not set 172.30.0.0/29 is subnetted, 1 subnets C 172.30.10.0 is directly connected, Serial0/0.1 10.0.0.0/24 is subnetted, 4 subnets C 10.3.1.0 is directly connected, Loopback1 C 10.3.3.0 is … Continue reading EIGRP (NMBA-Multipoint frame-relay): Configure routing part 2 →

EIGRP (NMBA-Multipoint frame-relay): Configure routing part 1

Scenario: Recently MTA corporation has opened up 3 offices, you are being tasked to setup edge routers of each office. Since MTA office networks only use Cisco routers you suggested to your boss on using EIGRP. You explained the advantages of using EIGRP: 1. It is the only routing protocol that support multiple network protocols … Continue reading EIGRP (NMBA-Multipoint frame-relay): Configure routing part 1 →