Tweaks

EIGRP (Enhanced Interior Gateway Routing Protocol) IPv6 provides network administrators with several tunable parameters, or tweaks, allowing customization to better suit specific network requirements. The maximum path, metric weight, and maximum hopcount are key parameters in this regard. The maximum path parameter dictates the maximum number of parallel routes that EIGRP IPv6 can use for load balancing. Administrators can adjust this value to optimize path diversity based on the network's characteristics. The metric weight tweak enables the assignment of importance to various metrics like bandwidth, delay, reliability, load, and MTU. By assigning different weights to these metrics, administrators can influence the EIGRP IPv6 metric calculation, shaping path selection based on specific performance criteria. Additionally, the maximum hopcount tweak sets an upper limit on the number of hops or routers a packet can traverse within the EIGRP IPv6 domain, helping to prevent routing loops and ensuring network stability. Together, these EIGRP IPv6 tweaks provide a flexible toolkit for administrators to fine-tune the protocol's behavior and adapt it to the unique demands of their IPv6 network.

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 IPv6 EIGRP Tweaks

Step 1: Change K – Values in Ipv6 EIGRP Process using metric weight command

R1:
ipv6 router eigrp 100
metric weights 0 1 10 1 0 0
exit

R2:
ipv6 router eigrp 100
metric weights 0 1 10 1 0 0
exit

R3:
ipv6 router eigrp 100
metric weights 0 1 10 1 0 0
exit

R4:
ipv6 router eigrp 100
metric weights 0 1 10 1 0 0
exit

K value defines the Metric Weight and should be changed on every router in same autonomous

Step 2: Verify neighborship using show ipv6 eigrp neighbor command

R2#show ipv6 eigrp neighbors
EIGRP-IPv6 Neighbors for AS(100)
H   Address                      Interface     Hold    Uptime   SRTT   RTO   Q    Seq
                                              (sec)             (ms)         Cnt  Num
0   Link-local address:          Se2/0         11      00:01:31  12    100   0    10
    FE80::A8BB:CCFF:FE00:100
1   Link-local address:          Et0/0         14      00:01:29  5     100   0    6
    FE80::A8BB:CCFF:FE00:300

Step 3: Change Maximum path for load-balancing, default is 16

R2:
ipv6 router eigrp 100
maximum-path 20

Maximum path for load balancing is changed to 20, default is 16

Step 4: Verify using show ipv6 protocols command:

R2#show ipv6 protocols
IPv6 Routing Protocol is "connected"
IPv6 Routing Protocol is "ND"
IPv6 Routing Protocol is "eigrp 100"
EIGRP-IPv6 Protocol for AS(100)	
  Metric weight K1=1, K2=10, K3=1, K4=0, K5=0
  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
  Interfaces:
    Loopback1
    Loopback2
    Loopback3
  Redistribution:
    None

Step 5: Change IPv6 EIGRP maximum hopcount, default is 100

R1:
ipv6 router eigrp 100
metric maximum-hops 255
exit

EIGRP scalability is by default 100 but is changed to 255. Now EIGRP scalability is changed to 255 means now EIGRP router has 255 hops visibility.

Step 6: Verify using show ipv6 protocols command:

R1#show ipv6 protocols
IPv6 Routing Protocol is "connected"
IPv6 Routing Protocol is "ND"
IPv6 Routing Protocol is "eigrp 100"
EIGRP-IPv6 Protocol for AS(100)
  Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
  Router-ID: 22.0.3.2
  Topology : 0 (base)
    Distance: internal 90 external 170
    Maximum path: 20
    Maximum hopcount 255
    Maximum metric variance 1
  Interfaces:
    Loopback1
    Loopback2
    Loopback3
  Redistribution:
    None