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Layer-3 (IPv4) functionality limited to max 12 "destination addresses" on a stacked S5120-EI

Oleppa
Frequent Visitor

Layer-3 (IPv4) functionality limited to max 12 "destination addresses" on a stacked S5120-EI

We have problems with adding more than 12 static IPv4 routing subnets on a dual (stacked) S5120-EI 24 switch (connected with 10Gbit Ethernet modules).

If I add one ore more destination subnets, the switch accepts it, BUT it looks (to me) that the switch chooses to let the first 12 active routing subnets to work properly.

(I first thought that the switch chooses randomly witch 12 routing lines are able to work properly.

After a reboot 12 other routing subnets might work properly than before the reboot)

If I move the extra routing subnets to another (stacked) S5120-EI switch, it works (as long as I stay under 13 subnets on each switch I suppose).

 

Firmware updated to: A5120EI-CMW520-R2208P01-S168.bin

Bootrom updated to: A5120EI-BTM_607.btm

 

#
interface Ten-GigabitEthernet1/1/2
#
interface Ten-GigabitEthernet2/1/1
#
 ip route-static 0.0.0.0 0.0.0.0 Vlan-interface1 10.10.0.2
 ip route-static 10.20.0.0 255.255.255.0 Vlan-interface9 10.9.0.1
 ip route-static 10.30.0.0 255.255.255.0 Vlan-interface9 10.9.0.1
 ip route-static 10.40.0.0 255.255.255.0 Vlan-interface9 10.9.0.1
 ip route-static 10.50.0.0 255.255.255.0 Vlan-interface9 10.9.0.1
 ip route-static 10.60.0.0 255.255.255.0 Vlan-interface9 10.9.0.1
 ip route-static 10.70.0.0 255.255.255.0 Vlan-interface9 10.9.0.1
 ip route-static 10.80.0.0 255.255.255.0 Vlan-interface9 10.9.0.1
 ip route-static 10.90.0.0 255.255.255.0 Vlan-interface9 10.9.0.1
 ip route-static 82.195.48.0 255.255.255.248 Vlan-interface1 10.10.0.3
 ip route-static 194.104.96.44 255.255.255.255 Vlan-interface1 10.10.0.3
 ip route-static 213.61.190.58 255.255.255.255 Vlan-interface1 10.10.0.3
#

1 REPLY
paulgear
Esteemed Contributor

Re: Layer-3 (IPv4) functionality limited to max 12 "destination addresses" on a stacked S5

I know it doesn't help you work around this limitation, but if you need 12 static routes, your network is complex enough that you really should be moving to dynamic routing.  Even if it's only RIPv2 (OSPF would be even better), at least it will give you the flexibility that when you add another VLAN it will take care of the routing itself.

Regards,
Paul