EIGRP FD Inaccessible

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Jan 30th, 2009
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Hello All


Small confusion here.. I have two routers with identical configs of eigrp.. The idea here is to advertise a static route connected to the core routers.


We are now trying to advertise the supernet of the static segment with the following commands:


router eigrp 1000

redistribute static

network 192.168.96.0 0.0.31.255


There are several static routes on this segment which are also filtered using a dist list.. we do not have 192.168.96.0 in the distribute list, which means they arent redistributed via static..


ip route 192.168.96.0 255.255.224.0 Null0

ip route 192.168.102.0 255.255.255.240 192.25.83.2


Problem here is the FD is inaccessible for this subnet.. and hence the supernet route is not propagated..


P 192.168.96.0/19, 0 successors, FD is Inaccessible

via 172.26.4.54 (3072/2816), GigabitEthernet0/2

via 172.26.4.22 (3072/2816), GigabitEthernet0/1

via 192.168.1.13 (122624/109824), Serial1/0

via 192.168.1.242 (2816/256), GigabitEthernet0/3


There is another router with same ditto config, and it generates this route in EIGRP with Rstatic..


P 192.168.0.0/19, 1 successors, FD is 256256 via Rstatic (256256/0)


Any insights ?

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mlitka Fri, 01/30/2009 - 07:51
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This seems to contradict what you are trying to do:


There are several static routes on this segment which are also filtered using a dist list.. we do not have 192.168.96.0 in the distribute list, which means they arent redistributed via static..

sachinraja Fri, 01/30/2009 - 08:28
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We do not want the supernet to redistribute via static.. we dont want it to be an External Route.. We want the supernet as an internal route, but the FD is inaccessible..


Raj

sachinraja Fri, 01/30/2009 - 10:24
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what has that got to do with your answer ?? are you a quad CCIE ??


Raj

lejoe.thomas Fri, 01/30/2009 - 19:07
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Hi Sachin,


If the supernet is a static route, how will you get into EIGRP without redistributing it, in which case it will become an external route. I didnt quite get that part.

Well if the FD is inaccessible, it means the Router is not using the EIGRP learnt  route for 192.168.96.0/19 in the routing table.  Could you also do show ip route for 192.168.96.0/19


http://supportwiki.cisco.com/ViewWiki/index.php/EIGRP_route_is_not_installed_in_the_routing_table


HTH


Lejoe

royalblues Fri, 01/30/2009 - 23:56
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Raja,


I agree with Lejoe.. If the the supernet is a static route and is getting redistributed, EIGRP will always learn it as an external route.


The command router eigrp 1000 network 192.168.96.0 0.0.31.255 does not actually advertise the subnet to the neighbors . It merely starts the EIGRP process on that segment


However if you are just redistributing the static routes into eigrp , then the topology table should show it as Rstatic and not inaccessible which means the router is using other protocol to route the traffic to that subnet. A network topology and sh ip route from the routers woudl help.


If you want the route to be advertised as a eigrp internal route, then you can define a /32 loopback intrface from the ip subnet 192.168.96.x network and summarize it to /19 out the interface to the neighbors


int loopback 1000 


ip add 192.168.96.1 255.255.255.255


interface [ID]  


ip summary-address eigrp 1000 192.168.96.0 255.255.224.0


 Narayan


 

Giuseppe Larosa Sat, 01/31/2009 - 02:40
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Hello Sachin,


I agree with Narayan the only way to build an internal EIGRP route is to have a component subnet advertised with a network command in the EIGRP process


int loop1


ip add 192.168.96.1 255.255.255.255


router eigrp 1000


network 192.169.96.0 0.0.0.0


on the interfaces from distribution to access


ip summary-address eigrp 1000 192.168.96.0 255.255.224.0


Actually I used network command in EIGRP for a static route to advertise the default network and it worked (I was surprised of this).


Verify if the static route you are referring to is some form of floating static route and the router is using other routing source to route to that prefix.


Hope to help


Giuseppe


 

Gregory Camp Sat, 01/31/2009 - 14:01
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Sachin,


Are you setting a default metric for the static route when you redistribute it into EIGRP?  If you do not, the EIGRP will assign it the infinite metric.

royalblues Sat, 01/31/2009 - 15:02
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Static route redistribution into eigrp does not mandate a metric to be defined.


Narayan

Gregory Camp Sat, 01/31/2009 - 15:40
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Narayan,


I should have preface what I said.  Normally I would agree with you, but I have seen some problems in the past with redistributing static routes without setting a default metric.  I also agree we really need to see a show ip route to see if the correct route is installed in the routing table.

lejoe.thomas Sat, 01/31/2009 - 15:55
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Hi Narayan,


I guess I missed something regarding the statement


If the the supernet is a static route and is getting redistributed, EIGRP will always learn it as an external route.


If we're using the network command instead of redistribute static, there's a difference.If the static route is pointed to an interface and the network command is used for the specifying the static route, EIGRP redistributes the route as if it were directly connected route, i.e to it's neigbours that route will appear with as D as opposed to D EX.


http://www.cisco.com/en/US/tech/tk365/technologies_white_paper09186a0080094cb7.shtml#statictointerface


 


But if the FD is inancessible for a route in EIGRP, it means the EIGRP route is not the one selected in the routing table. A show ip route might help to further troubleshoot the issue


Lejoe

Mohamed Sobair Sun, 02/01/2009 - 02:49
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Hi,


The reason because the traffic destined for  Network 192.168.69.0/19 is blackholed at this router. an thus there is no a Successor path for this network.


The Question is: why do you have a static route for 192.168.96.0/19 pointing to Null0?


HTH

Mohamed

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