"default-metric" statement

Answered Question
Jan 9th, 2010

Hi

I was testing mutual redistribution between EIGRP and OSPF, under eigrp process without

"default-metric" statement, mutual redistribution doesnt work.

router eigrp 1
redistribute ospf 4

network 192.168.1.20 0.0.0.3
default-metric 100000 1000 255 1 1500
no auto-summary
!
router ospf 4
log-adjacency-changes
redistribute eigrp 1 subnets
network 10.10.10.1 0.0.0.0 area 0

Is "default-metric" statement a must.

I have this problem too.
0 votes
Correct Answer by Giuseppe Larosa about 6 years 11 months ago

Hello Saquib,

your understanding is correct for EIGRP to be able to import routes from another dynamic routing protocol a seed metric has to be set with default metric command.

This is actually one of first checks in troubleshooting redistribution into EIGRP.

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094613.shtml#rdc

the reason is that EIGRP composite metric cannot be compared to the metric of the source protocol, the seed metric provides values for bandwidth, delay and other parameters.

OSPF is a special case it has default seed metrics.

Hope to help

Giuseppe

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 5 (1 ratings)
Loading.
Correct Answer
Giuseppe Larosa Sat, 01/09/2010 - 05:22

Hello Saquib,

your understanding is correct for EIGRP to be able to import routes from another dynamic routing protocol a seed metric has to be set with default metric command.

This is actually one of first checks in troubleshooting redistribution into EIGRP.

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094613.shtml#rdc

the reason is that EIGRP composite metric cannot be compared to the metric of the source protocol, the seed metric provides values for bandwidth, delay and other parameters.

OSPF is a special case it has default seed metrics.

Hope to help

Giuseppe

Mohamed Sobair Sat, 01/09/2010 - 07:01

Hi,

why the seed metric is needed whenever you redistribute between any protocol to Eigrp or Rip?

Those protocols requires a (seed metric), it can be configured manually or through the (default-metric) command. The reason behind this is because those protocol doesnt recognize (metric 0).

As whenever a route is redistributed without a seed metric, a metric of 0  by default is a ssigned to those routes and is therfore is not taken by RIP or EIGRP cause they both dont recognize metric 0.  However ,  In (ISIS) routing protocol, you dont have to a ssign a metric or a seed metric whenever you redistibute into ISIS as it recognizes metric 0.

HTH

Mohamed

Actions

This Discussion