Tweaks

EIGRP (Enhanced Interior Gateway Routing Protocol) Named Mode introduces named tweaks, providing enhanced configurability for key parameters. Among these, the Maximum Path, Metric Weight, and Maximum Hopcount tweaks allow network administrators to fine-tune routing behavior. The Maximum Path tweak allows control over the number of parallel paths considered during route calculation, enabling administrators to balance network traffic and optimize resource utilization. Metric Weight allows for the customization of the EIGRP composite metric components, letting administrators assign different weights to parameters like bandwidth and delay. This flexibility allows for precise control over route selection based on specific network characteristics. Additionally, the Maximum Hopcount tweak permits administrators to limit the number of hops a route can traverse, preventing suboptimal paths or loops. EIGRP Named Mode's named tweaks empower administrators to tailor routing decisions, resulting in more efficient and customized network configurations.

Lab:

Disclaimer

This Configuration Guide is designed to assist members to enhance their skills in particular technology area. While every effort has been made to ensure that all material is as complete and accurate as possible, the enclosed material is presented on an Dzas isdz basis. Neither the authors nor Forum assume any liability or responsibility to any person or entity with respect to loss or damages incurred from the information contained in this guide. This configuration guide was developed by Forum. Any similarities between material presented in this configuration guide and any other material is completely coincidental.

Cisco IOS Software, Linux Software (I86BI_LINUX-ADVENTERPRISEK9-M), Version 15.2(4)M1, DEVELOPMENT TEST SOFTWARE

Task 1: Configure EIGRP Tweaks using named configuration

Step 1: In the configuration mode of router configure IPv4 EIGRP process with a name & enter address-family interface mode

R1:
router eigrp cisco
address-family ipv4 autonomous-system 100
net 12.0.0.1 0.0.0.0
net 11.0.1.1 0.0.0.0
net 11.0.2.1 0.0.0.0
net 11.0.3.1 0.0.0.0

Step 2: Change K – Values in EIGRP Process using metric weight command

R1:
router eigrp cisco
address-family ipv4 autonomous-system 100
metric weight 0 1 10 1 0 0
exit

R2:
router eigrp cisco
address-family ipv4 autonomous-system 100
metric weight 0 1 10 1 0 0
exit

R3:
router eigrp cisco
address-family ipv4 autonomous-system 100
metric weight 0 1 10 1 0 0
exit

R4:
router eigrp cisco
address-family ipv4 autonomous-system 100
metric weight 0 1 10 1 0 0
exit

Step 3: Verify neighborship using show ip eigrp neighbor command

R2#show ip eigrp neighbors
EIGRP-IPv4 VR(cisco) Address-Family Neighbors for AS(100)
H   Address      Interface      Hold   Uptime   SRTT   RTO   Q    Seq
      			                   (sec)            (ms)         Cnt  Num
1   12.0.0.1      Se2/0         12     00:00:38  14    100   0    18
0   23.0.0.3      Et0/0         11     00:00:42  12    100   0    40

Step 4: Change Maximum path for load-balancing, default is 16

R2:
router eigrp cisco
address-family ipv4 autonomous-system 100
topology base
maximum path 20
exit

Step 5: Verify using show ip protocols command

R2#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 VR(cisco) Address-Family Protocol for AS(100)
Metric weight K1=1, K2=10, K3=1, K4=0, K5=0 K6=0
Metric rib-scale 128
Metric version 64bit
NSF-aware route hold timer is 240
Router-ID: 22.0.3.2
Topology : 0 (base)
Active Timer: 3 min
Distance: internal 90 external 170
Maximum path: 20
Maximum hopcount 100
Maximum metric variance 1
Total Prefix Count: 12
Total Redist Count: 0

Automatic Summarization: disabled
Maximum path: 20
Routing for Networks:
12.0.0.2/32
22.0.1.2/32
22.0.2.2/32
22.0.3.2/32
23.0.0.2/32
Routing Information Sources:
    Gateway         Distance      Last Update
    12.0.0.1          90          00:03:56
    23.0.0.3          90          00:01:13
Distance: internal 90 external 170

Step 6: Change EIGRP maximum hopcount, default is 100

R2:
router eigrp cisco
address-family ipv4 autonomous-system 100
topology base
metric maximum-hops 255  

Step 7: Verify using show ip protocols command

R2#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 VR(cisco) Address-Family Protocol for AS(100)
Metric weight K1=1, K2=10, K3=1, K4=0, K5=0 K6=0
Metric version 64bit
Router-ID: 22.0.3.2
Topology : 0 (base)
Distance: internal 90 external 170
Maximum path: 4
Maximum hopcount 255
Maximum metric variance 1
Automatic Summarization: disabled
Maximum path: 4
Routing for Networks:
    12.0.0.2/32
    22.0.1.2/32
    22.0.2.2/32
    22.0.3.2/32
    23.0.0.2/32
Routing Information Sources:
    Gateway         Distance      Last Update
    12.0.0.1        90            00:01:12
    23.0.0.3        90            00:01:12
Distance: internal 90 external 170