9300 Essentials license, 1000 OSPF routes.

[rakuten02]

I have a 9300 switch with an Essentials license. It has a limitation of 1000 OSPF routes.

Will there be a log to indicate that this limitation has been hit? I could not find any information on this.

When I do show ip route summary to check the total number of OSPF routes the switch has learnt, which column is the one that is being checked for the 1000 route limit?

Networks or Subnets  ?

Example from Cisco reference:

Router# show ip route summary
	 
	Route Source    Networks    Subnets     Overhead    Memory (bytes)
	connected       0           3           126         360
	static          1           2           126         360
	igrp 109        747         12          31878       91080
	internal        3                                   360
	Total           751         17          32130       92160
	Router#

[MHM Cisco World]

show ip ospf

The show ip route summary give hint about route success inject from ospf into rib.

But I think license is talking about all ospf prefix success inject and failed inject into rib.

Show ip ospf 

Can give hint the number of prefix in all ospf' notice that the prefix in ospf is send ad lsa so number of prefix is equal to lsa number.

Lsa = prefix true for all lsa except lsa1 which I think one lsa can carry multi prefix' to be sure I will make check in lab and share result here

MHM

[MHM Cisco World]

show ip route summary
the routes of ospf appear as OSPF not as IGRP

the LSA1 can contain more than one prefix 

the number of prefix for each LSA1 appear in show ip ospf database (count)

show ip ospf display the number of LSA 
but it better to use

show ip ospf database and count all prefix 
thanks 
MHM

[balaji.bandi]

check show sdm prefer - give you the limitation (what IOS XE code running on the devices)

you mentioned switch and output show router (is this correct device ?)  what we looking

can you post show version  (output)  

if you enabled OSPF you should see as below :

I have not noticed the output you posted above :

igrp 109 

[rakuten02]

Thanks all! 

Please ignore the command output in my question, I took it from a Cisco Reference page as an example.

The total number of prefixes is 2948 when I do show ip ospf dtatabase.
show ip ospf shows AS LSA as 2948 as well.

From show ip route summary, if I add both Networks + Subnets, I get 2949. 

So it seems that I have exceeded the 1000 OSPF routes based on Essentials license. However, how would I know which OSPF route is removed from the routing table due to license limitation?

[balaji.bandi]

you will the logs (i dont recall that log)  and some routes not going to install in the database - the routing fails.

if this is edge device and only 1 exit point - then summary will be best to give default route.

[rakuten02]

I do not see any logs related to exceeding OSPF routes limit.. It could be only shown at the start when OSPF was enabled. I am not sure.

Oh thanks, what do you mean by summary? 

I configured a default static route 0.0.0.0 0.0.0.0 192.168.3.1, but I am afraid that 192.168.3.1 may be out of the routing table.. so far it works well. 192.168.3.1 is the IP of the gateway switch. 

There is only 1 exit point for this switch.

[balaji.bandi]

if the switch not have any other downlink suggest to `be no summary - so you can minimise the route entry that fit your needs :

https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/6208-nssa.html

its all depends on how your OSPF designed

[balaji.bandi]

Cat 9300 License enablement  - is the features you can use (yes that hardware have capabilities more with advantage License model)

[Giuseppe Larosa]

Hello @rakuten02 ,

move the switch to a totally stub area . The configuration has to be performed on the switch and on the upstream neighbor that will become ABR (0,X)

where X is the totaly stub area

on upstream device

router ospf 10

area 11 stub no summary

network 192.168.3.0 0.0.0.255 area 11

on the edge switch

router ospf 10

area 11 stub

network 0.0.0.0 255.255.255.255 area 11

Hope to help

Giuseppe

[MHM Cisco World]

What is the lsa type that have highest numbers?
I check twice there is no limit number in data sheet of c9300 can you share the doc. you have 

MHM

[rakuten02]

it is due to the essentials license limitation, not the hardware.

https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-9300-series-switches/nb-06-cat9300-ser-data-sheet-cte-en.html#Softwarerequirements

[MHM Cisco World]

I see.

So Q are 

1- how to know which prefix inject into rib? You can use show ip ospf database and check router bit for each prefix' the prefix without router bit is not inject into rib

2-can I reduce prefix? There are many way to reduce prefix in ospf db' 

One of them 

If the lsa is lsa5 or lsa7 then use summary 

If the lsa is lsa1 the  use prefix-suppresion 

MHM