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You are here: Home → White Papers → Load balancing and Variance
White Papers

Load balancing and Variance

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White Papers

Load balancing and Variance

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Load balancing and Variance

RST Forum White Paper

 

LAB24: EIGRP – IPv6

Disclaimer

This Configuration Guide is designed to assist members to enhance their skills in respective 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 “as is” 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 Lab Guide was developed by RSTForum. ​​ Any similarities between material presented in this configuration guide and any other material is completely coincidental.

 

LAB 24: Diagram

Note: This Lab was developed on​​ Cisco IOS Version15.2(4) M1 ADVENTERPRISEK9-M.

LAB24: IPv6 EIGRP Load balancing and Variance​​ 

 

Task 1: Configure IPv6 EIGRP Load balancing and variance

 

  • Configure redundant path between two routers

 

R1:

interface serial 2/0

ipv6 address 12::1/64 eui-64

no shutdown

interface serial 2/3

ipv6 address 21::1/64 eui-64

no shutdown

interface loopback 1

ipv6 address 11:0:1::1/64

interface loopback 2

ipv6 address 11:0:2::1/64

interface loopback 3

ipv6 address 11:0:3::1/64

exit

 

R2:

interface serial 2/0

ipv6 address 12::2/64 eui-64

no shutdown

interface serial 2/3

ipv6 address 43::2/64 eui-64

no shutdown

interface ethernet 0/0

ipv6 address 23::2/64 eui-64

no shutdown

interface loopback 1

ipv6 address 22:0:1::2/64

interface loopback 2

ipv6 address 22:0:2::2/64

interface loopback 3

ipv6 address 22:0:3::2/64

exit

 

 ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ R3:

interface serial 2/0

ipv6 address 34::3/64 eui-64

no shutdown

interface serial 2/3

ipv6 address 21::3/64 eui-64

no shutdown

interface ethernet 0/0

ipv6 address 23::3/64​​ eui-64

no shutdown

interface loopback 1

ipv6 address 33:0:1::3/64

interface loopback 2

ipv6 address 33:0:2::3/64

interface loopback 3

ipv6 address 33:0:3::3/64

exit

 

R4:

interface serial 2/0

ipv6 address 34::1/64 eui-64

no shutdown

interface serial 2/3

ipv6 address 43::4/64 eui-64

no shutdown

interface loopback 1

ipv6 address 44:0:1::4/64

interface loopback 2

ipv6 address 44:0:2::4/64

interface loopback 3

ipv6 address 44:0:3::4/64

exit

 

  • Configure IPv6 EIGRP to learn routes over multiple paths

 

R1:

ipv6 unicast-routing

ipv6 router eigrp 100

interface serial 2/0

ipv6 eigrp 100

interface serial 2/3

ipv6 eigrp 100

interface loopback 1

ipv6 eigrp 100

interface loopback 2

ipv6 eigrp 100

interface loopback 3

ipv6 eigrp 100

exit

 

 

R2:

ipv6 unicast-routing

ipv6​​ router eigrp 100

interface serial 2/0

ipv6 eigrp 100

interface serial 2/3

ipv6 eigrp 100

interface ethernet 0/0

ipv6 eigrp 100

interface loopback 1

ipv6 eigrp 100

interface loopback 2

ipv6 eigrp 100

interface loopback 3

ipv6 eigrp 100

exit

 

R3:

ipv6 unicast-routing

ipv6 router eigrp 100

interface serial 2/0

ipv6 eigrp 100

interface serial 2/3

ipv6 eigrp 100

interface ethernet 0/0

ipv6 eigrp 100

interface loopback 1

ipv6 eigrp 100

interface loopback 2

ipv6 eigrp 100

interface loopback 3

ipv6 eigrp 100

exit

 

R4:

ipv6 unicast-routing

ipv6 router eigrp 100

interface serial 2/0

ipv6 eigrp 100

interface serial 2/3

ipv6 eigrp 100

interface loopback 1

ipv6 eigrp 100

interface loopback 2

ipv6 eigrp 100

interface loopback 3

ipv6 eigrp 100

exit

 

Step 3 ​​ Dual Diffusion​​ algorithm’s rule:

 

  • For a path to be even considering as a valid path its Advertise Distance (AD) should be less than 2 times current Feasible Distance (FD).

 

Valid path​​ = AD < 2*current FD

 

 Example:

 

(NOTE: On R3 Router there are 3 paths to reach 22:0:2::2/64 network:​​ 

1) Via 23::2/64 eui-64 2) Via 21::1/64 eui-64 3) via 34::/64 eui-64 but as seen below in the Topology Table of R3 there is only one path seen to reach 22:0:2::2/64 network.)

 

 R3#show ipv6 eigrp topology

 

P 22:0:2::/64, 1 successors, FD is 409600

 ​​​​  ​​ ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:200 (409600/128256), Ethernet0/0

 

(This is because of the rule that says “For a path to become a valid path its Advertised Distance (AD) should be less than 2 times current Feasible Distance (FD).​​ 

 

Valid path​​ = AD <​​ 2*current FD

 

As seen below in the Topology Table of R1 Router, its FD to reach 22:0:2::/64 is 2297856.

This is the FD that R1 is advertising to R3 router, which becomes AD to Reach 22:0:2::/64.

 

Now because this AD (2297856) is not less than 2 times current FD ( 2 X 409600 = 819200) hence it is not reflecting in the topology table.​​ 

Similarly path via 34:0::0:4/64 is also not reflecting.

 

 

 R1#show ip eigrp topology

 

P 33:0:2::/64, 1 successors, FD is 2297856

 ​​ ​​ ​​ ​​ ​​ ​​ ​​​​   via FE80::A8BB:CCFF:FE00:300 (2297856/128256), Serial2/3

 ​​ ​​ ​​ ​​ ​​ ​​ ​​​​   via FE80::A8BB:CCFF:FE00:200 (2323456/409600), Serial2/0

 

 

 

  • For a path to become Feasible Successor (FS) its Advertise Distance (AD) should be less than current Feasible Distance (FD)

 

FS = AD < current FD

 

Example:

 

(NOTE:​​ On R1 Router there are 2 paths to reach 33:0:2::/64 network:​​ 

1) Via 12::2/64 eui-64 2) Via 21::3/64 eui-64.

As seen below in the Topology Table of R1 Router, path via 21::2/64 eui-64 is successor, as its FD (2297856) is lower compared to the FD provided by path via 12::2/64 eui-64.

 

Now the 2nd path via 12::2/64 eui-64 will considered as Feasible successor if it meets the following criteria

FS = AD < current FD

For a path to become Feasible Successor (FS) its Advertise Distance (AD) should be less than current Feasible Distance (FD)

 

Path Via 12::2/64 eui-64 has AD 409600 that is less than current FD 2297856 hence is will be considered as FS. )

 

R1#show ipv6 eigrp topology

 

P 33:0:2::/64, 1 successors, FD is 2297856

 ​​ ​​ ​​ ​​ ​​ ​​ ​​​​   via FE80::A8BB:CCFF:FE00:300​​ (2297856/128256), Serial2/3

 ​​ ​​ ​​ ​​ ​​ ​​ ​​​​   via FE80::A8BB:CCFF:FE00:200 (2323456/409600), Serial2/0

 

 

Step 4 Verify that only best routes are reflecting in routing table.

 

​​ R1#show ipv6 route

 

IPv6 Routing Table - default - 23 entries

Codes: C - Connected, L​​ - Local, S - Static, U - Per-user Static route

 ​​ ​​ ​​ ​​ ​​ ​​​​ B - BGP, HA - Home Agent, MR - Mobile Router, R - RIP

 ​​ ​​ ​​ ​​ ​​ ​​​​ H - NHRP, I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea

 ​​ ​​ ​​ ​​ ​​ ​​​​ IS - ISIS summary, D - EIGRP, EX - EIGRP external, NM - NEMO

 ​​ ​​ ​​ ​​ ​​ ​​​​ ND - ND​​ Default, NDp - ND Prefix, DCE - Destination, NDr - Redirect

 ​​ ​​ ​​ ​​ ​​ ​​​​ O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2

 ​​ ​​ ​​ ​​ ​​ ​​​​ ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2, l - LISP

C  ​​​​ 11:0:1::/64 [0/0]

 ​​ ​​ ​​ ​​​​ via Loopback1, directly connected

L  ​​​​ 11:0:1::1/128 [0/0]

 ​​ ​​ ​​ ​​​​ via Loopback1, receive

C  ​​​​ 11:0:2::/64 [0/0]

 ​​ ​​ ​​ ​​​​ via Loopback2, directly connected

L  ​​​​ 11:0:2::1/128 [0/0]

 ​​ ​​ ​​ ​​​​ via Loopback2, receive

 

C  ​​​​ 11:0:3::/64 [0/0]

 ​​ ​​ ​​ ​​​​ via Loopback3, directly connected

L  ​​​​ 11:0:3::1/128 [0/0]

 ​​ ​​ ​​ ​​​​ via Loopback3, receive

C  ​​​​ 12::/64 [0/0]

 ​​ ​​ ​​ ​​​​ via Serial2/0, directly connected

L  ​​​​ 12::A8BB:CCFF:FE00:100/128 [0/0]

 ​​ ​​ ​​ ​​​​ via Serial2/0, receive

C  ​​​​ 21::/64 [0/0]

 ​​ ​​ ​​ ​​​​ via Serial2/3, directly connected

L  ​​​​ 21::A8BB:CCFF:FE00:100/128 [0/0]

 ​​ ​​ ​​ ​​​​ via Serial2/3, receive

D  ​​​​ 22:0:1::/64 [90/2297856]

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:200, Serial2/0

D  ​​​​ 22:0:2::/64 [90/2297856]

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:200, Serial2/0

D  ​​​​ 22:0:3::/64 [90/2297856]

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:200, Serial2/0

D  ​​​​ 23::/64​​ [90/2195456]

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:200, Serial2/0

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:300, Serial2/3

D  ​​​​ 33:0:1::/64 [90/2297856]

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:300, Serial2/3

D  ​​​​ 33:0:2::/64 [90/2297856]

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:300, Serial2/3

D  ​​​​ 33:0:3::/64 [90/2297856]

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:300, Serial2/3

D  ​​​​ 34::/64 [90/2681856]

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:300, Serial2/3

 

D  ​​​​ 43::/64 [90/2681856]

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:200, Serial2/0

D  ​​​​ 44:0:1::/64 [90/2809856]

 ​​ ​​ ​​ ​​​​ via​​ FE80::A8BB:CCFF:FE00:300, Serial2/3

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:200, Serial2/0

D  ​​​​ 44:0:2::/64 [90/2809856]

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:300, Serial2/3

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:200, Serial2/0

D  ​​​​ 44:0:3::/64 [90/2809856]

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:300, Serial2/3

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:200, Serial2/0

L  ​​​​ FF00::/8 [0/0]

 ​​ ​​ ​​ ​​​​ via Null0, receive

 

 

 ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ Step 5 Configure Variance command in IPv6 EIGRP Process

 

R1:

ipv6 router eigrp 100

variance 2

exit

 

(EIGRP supports Unequal Metric​​ Path Load Balancing with the help of Variance.)

 

 

 ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ Step 6 Verify that multiple paths are reflecting in routers IPv6 routing table

 

R1#show ipv6 route

 

IPv6 Routing Table - default - 23 entries

Codes: C - Connected, L - Local, S - Static, U -​​ Per-user Static route

 ​​ ​​ ​​ ​​ ​​ ​​​​ B - BGP, HA - Home Agent, MR - Mobile Router, R - RIP

 ​​ ​​ ​​ ​​ ​​ ​​​​ H - NHRP, I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea

 ​​ ​​ ​​ ​​ ​​ ​​​​ IS - ISIS summary, D - EIGRP, EX - EIGRP external, NM - NEMO

 ​​ ​​ ​​ ​​ ​​ ​​​​ ND - ND Default, NDp - ND Prefix,​​ DCE - Destination, NDr - Redirect

 ​​ ​​ ​​ ​​ ​​ ​​​​ O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2

 ​​ ​​ ​​ ​​ ​​ ​​​​ ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2, l - LISP

C  ​​​​ 11:0:1::/64 [0/0]

 ​​ ​​ ​​ ​​​​ via Loopback1, directly connected

L  ​​​​ 11:0:1::1/128 [0/0]

 ​​ ​​ ​​ ​​​​ via Loopback1, receive

C  ​​​​ 11:0:2::/64 [0/0]

 ​​ ​​ ​​ ​​​​ via Loopback2, directly connected

L  ​​​​ 11:0:2::1/128 [0/0]

 ​​ ​​ ​​ ​​​​ via Loopback2, receive

C  ​​​​ 11:0:3::/64 [0/0]

 ​​ ​​ ​​ ​​​​ via Loopback3, directly connected

L  ​​​​ 11:0:3::1/128 [0/0]

 ​​ ​​ ​​ ​​​​ via Loopback3, receive

C ​​ ​​​​ 12::/64 [0/0]

 ​​ ​​ ​​ ​​​​ via Serial2/0, directly connected

 

L  ​​​​ 12::A8BB:CCFF:FE00:100/128 [0/0]

 ​​ ​​ ​​ ​​​​ via Serial2/0, receive

C  ​​​​ 21::/64 [0/0]

 ​​ ​​ ​​ ​​​​ via Serial2/3, directly connected

L  ​​​​ 21::A8BB:CCFF:FE00:100/128 [0/0]

 ​​ ​​ ​​ ​​​​ via Serial2/3, receive

D  ​​​​ 22:0:1::/64 [90/2297856]

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:200, Serial2/0

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:300, Serial2/3

D  ​​​​ 22:0:2::/64 [90/2297856]

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:200, Serial2/0

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:300, Serial2/3

D  ​​​​ 22:0:3::/64 [90/2297856]

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:200, Serial2/0

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:300, Serial2/3

D  ​​​​ 23::/64 [90/2195456]

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:200, Serial2/0

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:300, Serial2/3

D  ​​​​ 33:0:1::/64 [90/2297856]

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:200, Serial2/0

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:300, Serial2/3

D  ​​​​ 33:0:2::/64 [90/2297856]

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:200, Serial2/0

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:300, Serial2/3

D  ​​​​ 33:0:3::/64 [90/2297856]

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:200,​​ Serial2/0

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:300, Serial2/3

D  ​​​​ 34::/64 [90/2681856]

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:200, Serial2/0

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:300, Serial2/3

D  ​​​​ 43::/64 [90/2681856]

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:200, Serial2/0

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:300, Serial2/3

D  ​​​​ 44:0:1::/64 [90/2809856]

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:200, Serial2/0

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:300, Serial2/3

D  ​​​​ 44:0:2::/64 [90/2809856]

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:200, Serial2/0

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:300,​​ Serial2/3

D  ​​​​ 44:0:3::/64 [90/2809856]

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:200, Serial2/0

 ​​ ​​ ​​ ​​​​ via FE80::A8BB:CCFF:FE00:300, Serial2/3

L  ​​​​ FF00::/8 [0/0]

 ​​ ​​ ​​ ​​​​ via Null0, receive

 

(Variance commands will set the benchmark and IPv6 EIGRP Router will Load​​ Balancing the traffic between the paths within that benchmark which is reflected in router’s IPv6 routing table.)

 

 

 

 

 

 

 

 

 

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