在配置思科低端三層交換機時，如果應用了政策路由，交換機可能會提示如下資訊：（常見于3560/3750等平台）
%PLATFORM_PBR-4-SDM_MISMATCH: PBR requires sdm template routing
這是因為SDM（Switch Database Management）模闆選擇不對所緻。
輸入指令 sh sdm prefer 檢視SDM資訊（注意預設模闆為desktop default，還有 IPv4 policy based routing aces）
The current template is "desktop default" template.
The selected template optimizes the resources in
the switch to support this level of features for
8 routed interfaces and 1024 VLANs.
number of unicast mac addresses: 6K
number of IPv4 IGMP groups + multicast routes: 1K
number of IPv4 unicast routes: 8K
number of directly-connected IPv4 hosts: 6K
number of indirect IPv4 routes: 2K
number of IPv4 policy based routing aces: 0
number of IPv4/MAC qos aces: 0.5K
number of IPv4/MAC security aces: 1K
在配置模式下，輸入 sdm prefer routing ，重新開機後即可解決。
重新開機後檢視 sh sdm prefer，模闆已變成desktop routing。
The current template is "desktop routing" template.
The selected template optimizes the resources in
the switch to support this level of features for
8 routed interfaces and 1024 VLANs. number of unicast mac addresses: 3K
number of IPv4 IGMP groups + multicast routes: 1K
number of IPv4 unicast routes: 11K
number of directly-connected IPv4 hosts: 3K
number of indirect IPv4 routes: 8K
number of IPv4 policy based routing aces: 0.5K
number of IPv4/MAC qos aces: 0.5K
number of IPv4/MAC security aces: 1K