Same topology like before in EIGRP-offset-list classic mode , we are increasing the metric to reach
lo0 in R2
R1#
R1#sh ip access-list
Standard IP access list 2
10 permit 2.2.2.2
R1#
R1#sh run | s router
router eigrp cisco6
router eigrp cisco
!
address-family ipv4 unicast autonomous-system 100
!
topology base _+++++++++++++++note we have to conig everything in topology base
redistribute connected metric 10000 1 255 1 1500 route-map CONN
offset-list 2 in 300 Serial2/0
offset-list 2 in 300 Serial2/2
exit-af-topology
network 192.168.12.0
network 192.168.21.0
exit-address-family
This is before we applied the offset-list
R1(config-router-af)#do sh ip eigrp topo
EIGRP-IPv4 VR(cisco) Topology Table for AS(100)/ID(10.10.60.1)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 192.168.23.0/24, 2 successors, FD is 3045896258
via 192.168.12.2 (3045896258/1735176258), Serial2/0
via 192.168.21.1 (3045896258/1735176258), Serial2/2
P 192.168.21.0/24, 1 successors, FD is 1735175958
via Connected, Serial2/2
P 10.10.110.0/24, 2 successors, FD is 3374344258
via 192.168.12.2 (3374344258/2063624258), Serial2/0
via 192.168.21.1 (3374344258/2063624258), Serial2/2
P 192.168.12.0/24, 1 successors, FD is 1735175958
via Connected, Serial2/0
P 10.10.30.0/24, 1 successors, FD is 66191360
via Rconnected (66191360/0)
P 10.10.140.0/24, 2 successors, FD is 3374344258
via 192.168.12.2 (3374344258/2063624258), Serial2/0
via 192.168.21.1 (3374344258/2063624258), Serial2/2
P 10.10.150.0/24, 2 successors, FD is 3374344258
via 192.168.12.2 (3374344258/2063624258), Serial2/0
via 192.168.21.1 (3374344258/2063624258), Serial2/2
P 2.2.2.0/24, 2 successors, FD is 2062856258 <+++++++before after 2062855958
via 192.168.12.2 (2062856258/327762220), Serial2/0
via 192.168.21.1 (2062856258/327762220), Serial2/2
P 10.10.60.0/24, 1 successors, FD is 66191360, tag is 60
via Rconnected (66191360/0)
P 192.168.32.0/24, 2 successors, FD is 3901440300
via 192.168.12.2 (3901440300/2590720300), Serial2/0
via 192.168.21.1 (3901440300/2590720300), Serial2/2
P 10.10.20.0/24, 1 successors, FD is 66191360
via Rconnected (66191360/0)
P 10.10.40.0/24, 1 successors, FD is 66191360
via Rconnected (66191360/0)
P 10.10.130.0/24, 2 successors, FD is 3374344258
via 192.168.12.2 (3374344258/2063624258), Serial2/0
via 192.168.21.1 (3374344258/2063624258), Serial2/2
P 3.3.3.3/32, 2 successors, FD is 3374344258
via 192.168.12.2 (3374344258/2063624258), Serial2/0
via 192.168.21.1 (3374344258/2063624258), Serial2/2
P 10.1.1.0/30, 1 successors, FD is 66191360
via Rconnected (66191360/0)
P 10.10.10.0/24, 1 successors, FD is 66191360
via Rconnected (66191360/0)
P 1.1.1.1/32, 1 successors, FD is 66191360
via Rconnected (66191360/0)
P 10.10.50.0/24, 1 successors, FD is 66191360
via Rconnected (66191360/0)
P 10.10.120.0/24, 2 successors, FD is 3374344258
via 192.168.12.2 (3374344258/2063624258), Serial2/0
via 192.168.21.1 (3374344258/2063624258), Serial2/2
R1(config-std-nacl)#permit host 2.2.2.2R1(config-std-nacl)#exit
R1(config)#d sh ip eigrp topo
*Nov 13 17:38:54.956: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 192.168.12.2 (Serial2/0) is resync: intf route configuration changed
*Nov 13 17:38:54.956: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 192.168.21.1 (Serial2/2) is resync: intf route configuration changed
R1(config)#do sh ip eigrp topo | b 2.2.2.0
P 2.2.2.0/24, 2 successors, FD is 2062855958 +++++++++++++300 ADDED
via 192.168.12.2 (2062855958/327761920), Serial2/0
via 192.168.21.1 (2062855958/327761920), Serial2/2
P 10.10.60.0/24, 1 successors, FD is 66191360, tag is 60
via Rconnected (66191360/0)
P 192.168.32.0/24, 2 successors, FD is 3901440000
via 192.168.12.2 (3901440000/2590720000), Serial2/0
via 192.168.21.1 (3901440000/2590720000), Serial2/2
P 10.10.20.0/24, 1 successors, FD is 66191360
via Rconnected (66191360/0)
P 10.10.40.0/24, 1 successors, FD is 66191360
via Rconnected (66191360/0)
P 10.10.130.0/24, 2 successors, FD is 3374343958
via 192.168.12.2 (3374343958/2063623958), Serial2/0
via 192.168.21.1 (3374343958/2063623958), Serial2/2
P 3.3.3.3/32, 2 successors, FD is 3374343958
via 192.168.12.2 (3374343958/2063623958), Serial2/0
via 192.168.21.1 (3374343958/2063623958), Serial2/2
P 10.1.1.0/30, 1 successors, FD is 66191360
via Rconnected (66191360/0)
P 10.10.10.0/24, 1 successors, FD is 66191360
via Rconnected (66191360/0)
P 1.1.1.1/32, 1 successors, FD is 66191360
R1(config)#sh run
Friday 13 November 2015
EIGRP offset-list
This another method to influence the metric in a routing protocol. The offset-list lets you increase the metric when you send a routing update to your neighbor or when you receive it.
You can use this for RIP or EIGRP, it is not supported for OSPF.
In this example wewill show how we can increase the metric
lo01.1.1.1 lo02.2.2.2
R1 ========R2===========R3 (loopback 3.3.3.3)
R2#sh ip eigrp topo
P 10.10.130.0/24, 1 successors, FD is 2297856
via 192.168.23.3 (2297856/128256), Serial2/1
via 192.168.32.3 (5639936/128256), Ethernet0/1
P 3.3.3.3/32, 1 successors, FD is 2297856 ++++++++++++++
via 192.168.23.3 (2297856/128256), Serial2/1
via 192.168.32.3 (5639936/128256), Ethernet0/1
P 10.1.1.0/30, 2 successors, FD is 2195456
via 192.168.12.1 (2195456/281600), Serial2/0
via 192.168.21.2 (2195456/281600), Serial2/2
P 10.10.10.0/24, 2 successors, FD is 2297856
via 192.168.12.1 (2297856/128256), Serial2/0
via 192.168.21.2 (2297856/128256), Serial2/2
We introduce in router R2 a offset-list to reach 3.3.3.3
R2(config)#ip access-list standard 2
R2(config-std-nacl)#permit host 3.3.3.3
R2(config-std-nacl)#
R2(config-std-nacl)#end
R2#
R2(config)#router eigrp 100
R2(config-router)#off
R2(config-router)#offset-list 1 ?
in Perform offset on incoming updates
out Perform offset on outgoing updates
R2(config-router)#offset-list 1 in 300 se2/1
R2(config-router)#offset-list 1 out 300 se2/1
after
R2(config-router)#do sh ip eigrp topology | b 3.3.3.3
P 3.3.3.3/32, 1 successors, FD is 2298156 _++++++++++++++++++++
via 192.168.23.3 (2298156/128512), Serial2/1
via 192.168.32.3 (5639936/128256), Ethernet0/1
P 10.1.1.0/30, 2 successors, FD is 2195456
via 192.168.12.1 (2195456/281600), Serial2/0
via 192.168.21.2 (2195456/281600), Serial2/2
P 10.10.10.0/24, 2 successors, FD is 2297856
via 192.168.12.1 (2297856/128256), Serial2/0
via 192.168.21.2 (2297856/128256), Serial2/2
P 1.1.1.1/32, 2 successors, FD is 2170112
via 192.168.12.1 (2170112/256256), Serial2/0
via 192.168.21.2 (2170112/256256), Serial2/2
P 10.10.50.0/24, 2 successors, FD is 2297856
via 192.168.12.1 (2297856/128256), Serial2/0
via 192.168.21.2 (2297856/128256), Serial2/2
P 10.10.120.0/24, 1 successors, FD is 2298156
via 192.168.23.3 (2298156/128512), Serial2/1
via 192.168.32.3 (5639936/128256), Ethernet0/1
R2(config-router)#
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