Cisco 3560 currently layer 2 only. Want to make it Layer 3. downside while in production????

[Steve Coady]

All

The device is trunking traffic to WAN router. I want to adapt this 3560 to connect a separate network to it. and then have the new network use WAN to get out. 

No default gateway was set. I would add the static to use same WAN link. 

Ip routing is not enabled on the device. What type of outage will occur by enabling ip routing?

[ahmedshoaib · Accepted solution]

Hi; For enabling IP routing there will be not impact. If in future if you want to modify L2 link between Switch & WAN Router to L3 then there will be outage. Thanks & Best regards;

[Iulian Vaideanu · Accepted solution]

There might also be a problem if the switch is currently running the VLAN SDM template (no unicast routes can be programmed in hardware)...

[Steve Coady]

03.03.05SE cat3k_caa-universalk9

switch# sh sdm prefer
Showing SDM Template Info

This is the Advanced (low scale) template.
Number of VLANs: 4094
Unicast MAC addresses: 32768
Overflow Unicast MAC addresses: 512
IGMP and Multicast groups: 4096
Overflow IGMP and Multicast groups: 512
Directly connected routes: 32768
Indirect routes: 7680
Security Access Control Entries: 1536
QoS Access Control Entries: 3072
Policy Based Routing ACEs: 1024
Netflow ACEs: 1024
Input Microflow policer ACEs: 256
Output Microflow policer ACEs: 256
Flow SPAN ACEs: 256
Tunnels: 256
Control Plane Entries: 512
Input Netflow flows: 8192
Output Netflow flows: 16384
SGT/DGT entries: 4096
SGT/DGT Overflow entries: 512
These numbers are typical for L2 and IPv4 features.
Some features such as IPv6, use up double the entry size;
so only half as many entries can be created.

[Iulian Vaideanu]

I'm not familiar with the 3650 (it's 3560 in the subject), but based on this output your switch should be good to go for layer3...