What Is An Sdm Template
Configuring SDM Templates
The Catalyst 3750 switch control reference has command syntax and usage data. Unless otherwise noted, the term switch refers to a standalone switch and a switch stack.
- Understanding the SDM Templates
- Configuring the Switch SDM Template
- Displaying the SDM Templates
Understanding the SDM Templates
Yous can use SDM templates to configure arrangement resources in the switch to optimize back up for specific features, depending on how the switch is used in the network. You tin select a template to provide maximum system usage for some functions or apply the default template to balance resources.
To classify ternary content addressable retentivity (TCAM) resources for different usages, the switch SDM templates prioritize system resources to optimize back up for sure features. You tin select SDM templates to optimize these features:
- Access—The access template maximizes organisation resource for access command lists (ACLs) to accommodate a large number of ACLs.
- Default—The default template gives balance to all functions.
- Routing—The routing template maximizes system resources for IPv4 unicast routing, typically required for a router or aggregator in the centre of a network.
- VLANs—The VLAN template disables routing and supports the maximum number of unicast MAC addresses. Information technology would typically exist selected for a Layer two switch.
In addition, the dual IPv4 and IPv6 templates enable a dual stack environment. Meet the "Dual IPv4 and IPv6 SDM Templates" department.
There are two versions of each template: a desktop template and an aggregator template. The Catalyst 3750-12S switch can use the larger TCAM size available in the aggregator templates or can use the standard desktop templates. All other Goad 3750 switches back up just the desktop templates. If you practice non enter the desktop keyword on an aggregator switch, the aggregator templates are selected.
| | | | ||||||
|---|---|---|---|---|---|---|---|---|
| | | | | | | | | |
| Unicast MAC addresses | iv K | 6 One thousand | 3 Grand | 12 K | 6 Grand | half-dozen K | 6 K | 12 G |
| IGMP groups and multicast routes | 1 G | 1 G | 1 K | ane K | 1 Chiliad | i One thousand | i Thou | one K |
| Unicast routes | vi M | 8 K | 11 Grand | 0 | 12 K | 12 Thousand | xx Thou | 0 |
| iv K | 6 Thousand | 3 Thousand | 0 | 6 K | 6 One thousand | half-dozen K | 0 |
| 2 K | two Chiliad | 8 One thousand | 0 | 6 Thousand | 6 K | 14 K | 0 |
| Policy-based routing ACEs | 512 | 0 | 512 | 0 | 512 | 0 | 512 | 0 |
| QoS nomenclature ACEs | 512 | 512 | 512 | 512 | 896 | 896 | 512 | 896 |
| Security ACEs | ii K | 1 M | ane K | 1 K | 4 K | 1 K | 1 Thou | 1 K |
| Layer 2 VLANs | 1 Chiliad | 1 M | one K | 1 Grand | one K | 1 K | i K | 1 M |
The commencement 8 rows in the tables (unicast MAC addresses through security ACEs) stand for judge hardware boundaries set when a template is selected. If a section of a hardware resource is full, all processing overflow is sent to the CPU, seriously impacting switch performance. The last row is a guideline used to calculate hardware resource consumption related to the number of Layer 2 VLANs on the switch.
Dual IPv4 and IPv6 SDM Templates
You can select SDM templates to support IP Version half-dozen (IPv6). For more information about IPv6 and how to configure IPv6 routing, run across Chapter38, "Configuring IP Unicast Routing"
This software release does not support Policy-Based Routing (PBR) when forwarding IPv6 traffic. The software supports IPv4 PBR only when the dual-ipv4-and-ipv6 routing template is configured.
The dual IPv4 and IPv6 templates let the switch to exist used in dual stack environments (supporting both IPv4 and IPv6). Using the dual stack templates results in less TCAM capacity allowed for each resources. Practice not use them if y'all program to forward only IPv4 traffic.
These SDM templates support IPv4 and IPv6 environments:
- Desktop dual IPv4 and IPv6 default template—supports Layer two, multicast, routing, QoS, and ACLs for IPv4; and Layer 2, routing, and ACLs for IPv6 on desktop switches (all Catalyst 3750 switches except Catalyst 3750-12S).
- Desktop dual IPv4 and IPv6 routing template—supports Layer 2, multicast, routing (including policy-based routing), QoS, and ACLs for IPv4; and Layer 2, routing, and ACLs for IPv6 on desktop switches (all Catalyst 3750 switches except Catalyst 3750-12S).
- Desktop dual IPv4 and IPv6 VLAN template—supports basic Layer two, multicast, QoS, and ACLs for IPv4, and basic Layer 2 and ACLs for IPv6 on desktop switches.
- Aggregator dual IPv4 and IPv6 default template—supports Layer 2, multicast, routing, QoS, and ACLs for IPv4, and Layer 2 and routing for IPv6 on Goad 3750-12S aggregator switches.
- Aggregator dual IPv4 and IPv6 routing template—supports Layer 2, multicast, routing (including policy-based routing), QoS, and ACLs for IPv4; and Layer 2, routing, and ACLs for IPv6 on Catalyst 3750-12S aggregator switches.
- Aggregator dual IPv4 and IPv6 VLAN template—supports basic Layer 2, multicast, QoS, and ACLs for IPv4,and bones Layer two and ACLs for IPv6 on Catalyst 3750-12S switches.
Note 
An IPv4 route requires merely i TCAM entry. Considering of the hardware compression scheme used for IPv6, an IPv6 road tin can take more than 1 TCAM entry, reducing the number of entries forwarded in hardware. For example, for IPv6 directly continued IP addresses, the desktop template might let less than two thousand entries.
| | | | | | | |
|---|---|---|---|---|---|---|
| Unicast MAC addresses | two K | 1536 | 8 K | 2 K | 2K | viii One thousand |
| IPv4 IGMP groups and multicast routes | one K | 1K | 1 1000 | ane K | 1K | 0 |
| Total IPv4 unicast routes: | 3 K | 2816 | 0 | 3 K | 8K | 0 |
| 2 Grand | 1536 | 0 | two Grand | 2K | 0 |
| ane K | 1280 | 0 | 1 Chiliad | 6K | 1 Thou |
| IPv6 multicast groups | i K | 1152 | 1 Grand | 1 Thou | 2176 | 1 K |
| Total IPv6 unicast routes: | 3 M | 2816 | 0 | 3 Chiliad | 8K | 0 |
| 2 G | 1536 | 0 | 2 K | 2K | 0 |
| ane K | 1280 | 0 | one K | 6K | 0 |
| IPv4 policy-based routing ACEs | 0 | 256 | 0 | 0 | 512 | 0 |
| IPv4 or MAC QoS ACEs (total) | 512 | 512 | 512 | 876 | 896 | 876 |
| IPv4 or MAC security ACEs (total) | one K | 512 | 1K | 512 | 1K | 1 K |
| IPv6 policy-based routing ACEs2 | 0 | 255 | 0 | 0 | 510 | 0 |
| IPv6 QoS ACEs | 510 | 510 | 510 | 876 | 510 | 876 |
| IPv6 security ACEs | 510 | 510 | 510 | 876 | 510 | 876 |
1.Template estimates are based on a switch with eight routed interfaces and approximately 1000 VLANs.
two.IPv6 policy-based routing is not supported.
SDM Templates and Switch Stacks
All stack members utilize the same SDM template that is stored on the stack principal. When a new switch is added to a stack, as with the switch configuration and VLAN database files, the SDM configuration that is stored on the stack master overrides the template configured on an individual switch. For more than information about stacking, see Chapter5, "Managing Switch Stacks"
If the stack master is a desktop switch and a Catalyst 3750-12S running the aggregator template is added equally a stack member, the stack operates with the desktop template selected on the stack principal. This could result in configuration losses on the Catalyst 3750-12S if the number of TCAM entries on information technology exceeds desktop template sizes.
If the stack primary is a Catalyst 3750-12S switch using an aggregator template and a new stack member is non a Catalyst 3750-12S, the stack member is not able to support the template that is running on the stack master. The switch attempting to bring together the stack goes into SDM mismatch mode, the stack master does not attempt to alter the SDM template, and the switch cannot exist a performance member of the stack.
If the stack master is a Goad 3750-12S, changing the template tin can create these results:
- If you change the template from an aggregator template to a desktop template and reload the switch, the entire stack operates with the selected desktop template. This could cause configuration losses if the number of TCAM entries exceeds the desktop template sizes.
- If you modify the template from a desktop template to an aggregator template and reload the switch, whatsoever desktop switches that were role of the stack go into the SDM mismatch mode. When this occurs, a syslog message is sent to the stack chief indicating that a stack member has gone into the SDM mismatch fashion and suggesting the steps to take to bring the switch out of the mismatch mode.
You can use the testify switch privileged EXEC command to see if any stack members are in SDM mismatch style. This case shows the output from the prove switch privileged EXEC command when an SDM mismatch exists:
This is an case of a syslog message notifying the stack master that a stack member is in SDM mismatch mode:
Configuring the Switch SDM Template
- Default SDM Template
- SDM Template Configuration Guidelines
- Setting the SDM Template
Default SDM Template
The default template for desktop switches is the default desktop template. The default template for the Goad 3750-12S is the default aggregator template.
SDM Template Configuration Guidelines
- When y'all select and configure SDM templates, you must reload the switch for the configuration to take event.
- Utilise the sdm prefer vlan global configuration command only on switches intended for Layer two switching with no routing. When you utilize the VLAN template, no system resources are reserved for routing entries, and any routing is done through software. This overloads the CPU and severely degrades routing performance.
- Do not utilize the routing template if you do non have routing enabled on your switch. The sdm prefer routing global configuration command prevents other features from using the retentivity allocated to unicast routing in the routing template.
- If yous endeavour to configure IPv6 features without first selecting a dual IPv4 and IPv6 template, a warning message appears.
- Using the dual stack templates results in less TCAM capacity allowed for each resource, then exercise not use it if you programme to forward simply IPv4 traffic.
Setting the SDM Template
Beginning in privileged EXEC mode, follow these steps to use the SDM template to maximize feature usage:
| | | |
|---|---|---|
| Step i | configure concluding | Enter global configuration manner. |
| Step 2 | sdm adopt { admission | default | dual-ipv4-and-ipv6 { default | routing | vlan } | routing | vlan } [ desktop ] | Specify the SDM template to exist used on the switch: The keywords have these meanings:
This keyword is visible on Goad 3750-12S switches to use with the desktop keyword to set the switch to the default desktop template. (Use the no sdm prefer command to ready a desktop switch to the default desktop template or to gear up an aggregator switch to the default aggregator template.)
– – –
Use the no sdm prefer command to set up the switch to the default template. |
| Step 3 | end | Return to privileged EXEC mode. |
| Step iv | reload | Reload the operating system. |
After the system reboots, yous can utilize the show sdm prefer privileged EXEC command to verify the new template configuration. If you enter the testify sdm adopt command earlier y'all enter the reload privileged EXEC command, the show sdm prefer command shows the template in use and the template that becomes agile afterward a reload.
This is an instance of an output brandish when yous have changed the template and have not reloaded the switch:
To return to the default template, use the no sdm adopt global configuration command.
This example shows how to configure a switch with the routing template (the desktop routing template for a desktop switch or the aggregator routing template for a Catalyst 3750-12S).
This instance shows how to configure the desktop routing template on a Catalyst 3750-12S switch:
This example shows how to configure the IPv4-and-IPv6 default template on a desktop switch:
Displaying the SDM Templates
Use the show sdm prefer privileged EXEC command with no parameters to brandish the agile template.
Use the testify sdm prefer [ admission | default | dual-ipv4-and-ipv6 { default | vlan | routing } vlan [ desktop ]] privileged EXEC command to brandish the resource numbers supported past the specified template.
Annotation The desktop keyword is available only on Catalyst 3750-12S aggregator switches.
This is an example of output from the show sdm prefer control, displaying the template in use.
This is an example of output from the show sdm prefer routing control entered on an aggregator switch:
This is an example of output from the testify sdm adopt routing command entered on a desktop switch:
This is an example of output from the prove sdm adopt dual-ipv4-and-ipv6 default command entered on a desktop switch:
What Is An Sdm Template,
Source: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/release/12-2_55_se/configuration/guide/scg3750/swsdm.html
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