Cisco 3850 wont add anymore static routes?!

[Kyle Southworth]

Hi All

I have 2x 3850-48P switches stacked and I am having a very strange issue. 

This is my current scenario;

We are currently going through a LAN and WAN upgrade and we are migrating ISP and moving from our current Dell switching to Cisco. We have various WAN connections via either an MPLS network or IPSEC tunnel connections to our external sites. 

The MPLS comes through our new provider directly into our cisco 3850 stack.  Our IPSEC tunnel connected sites comes in via a different ISP through the Dell Switches. 

We have uplinks from Dell switch to the Cisco stack. Cisco has an SVI of 172.19.0.1 and Dell 172.19.0.2

Static routes from the Dell to go to Cisco for the external sites on the MPLS and static routes from Cisco to the Dell for the IPSEC tunnel connected sites. 

My issue is I can not longer add anymore static routes to the Cisco. Here is my current static routes:

S 172.19.11.0/24 [1/0] via 172.19.0.2
S 172.19.23.0/24 [1/0] via 172.19.0.2
S 172.19.29.0/24 [1/0] via 172.19.0.2
S 172.19.31.0/24 [1/0] via 172.19.0.2
S 172.19.36.0/24 [1/0] via 172.19.0.2
S 172.19.38.0/24 [1/0] via 172.19.0.2
S 172.19.39.0/24 [1/0] via 172.19.0.2
S 172.19.44.0/24 [1/0] via 172.19.0.2
S 172.19.46.0/24 [1/0] via 172.19.0.2
S 172.19.50.0/24 [1/0] via 172.19.0.2
S 172.19.52.0/24 [1/0] via 172.19.0.2
S 172.19.53.0/24 [1/0] via 172.19.0.2
S 172.19.54.0/24 [1/0] via 172.19.0.2
S 172.19.57.0/24 [1/0] via 172.19.0.2

All I want to do is add another static route to the Cisco switch: 

ip route 172.19.37.0 255.255.255.0 172.19.0.2

But when I press enter it does not add, nothing tells me is hasn't added unless I do a 'sh ip route' and the route I have added does not show. When I run the same command with a no in front I get '%No matching route to delete'.

I have checked the space left in NVRAM and I have more free than used so I know its not a space issue. 

I have managed to add many static routes up to this point without issue, what am I doing wrong?

[Georg Pauwen]

Hello,

are you running the LAN base feature set on these switches ? According to the documentation:

Switches running the LAN base feature set support 16 user-configured static routes, in addition to any default routes used for the management interface.

[Kyle Southworth]

Thanks very much chrihussey I have been able to achieve what I needed to with help from your post :)

As for LAN base, I will have to read up on this gpauwen as I am not familiar with this feature set and therefore not sure if I need it enabled. (thats if it can be disabled!)

[chrihussey · Accepted solution]

It appears there is a limitation to the number of static routes you can implement with LAN base. This doc says 16 total in a stack.

http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3850/software/release/3-2_0_se/routing/configuration_guide/b_rt_32se_3850_cg/b_rt_32se_3850_cg_chapter_010.html

I do see that you can consolidate some of your static routes to work around this:

change 172.19.38.0/24 & 172.19.39.0/24 to 172.19.38.0/23

change 172.19.52.0/24 & 172.19.53.0/24 to 172.19.52.0/23

This should be allow you to enter two more.

You could also consolidate 172.19.36,37.38.& 39 to 172.19.36.0/22.

Hope this helps