SDM Questions
| SDM Quick summary
SDM templates are used to configure system resources in the switch to optimize support for specific features, depending on how the switch is used in the network. You can select a template to provide maximum system usage for some functions or use the default template to balance resources. To allocate ternary content addressable memory (TCAM) resources for different usages, the switch SDM templates prioritize system resources to optimize support for certain features. You can select SDM templates to optimize these features: In addition, the dual IPv4 and IPv6 templates enable a dual stack environment. In order to configure SDM template, use this command under global configuration mode: sdm prefer {access | default | dual-ipv4-and-ipv6 {default | routing | vlan} | routing | vlan}. Command to verify SDM template: show sdm prefer In a switch stack, SDM template is stored in the master switch. |
Question 1
Explanation
SDM templates are used to configure system resources in the switch to optimize support for specific features, depending on how the switch is used in the network. You can select a template to provide maximum system usage for some functions or use the default template to balance resources.
To allocate ternary content addressable memory (TCAM) resources for different usages, the switch SDM templates prioritize system resources to optimize support for certain features. You can select SDM templates to optimize these features:
+ Access – The access template maximizes system resources for access control 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 center of a network.
+ VLANs – The VLAN template disables routing and supports the maximum number of unicast MAC addresses. It would typically be selected for a Layer 2 switch.
In addition, the dual IPv4 and IPv6 templates enable a dual stack environment.
Question 2
Explanation
The VLAN template disables routing and supports the maximum number of unicast MAC addresses. It would typically be selected for a Layer 2 switch.
Question 3
Explanation
The VLAN template disables routing and supports the maximum number of unicast MAC addresses. It would typically be selected for a Layer 2 switch.
Question 4
Explanation
The VLAN template disables routing and supports the maximum number of unicast MAC addresses. It would typically be selected for a Layer 2 switch only. But in this case this switch is also used for routing. The VLAN template disabled routing feature so all routing processing is sent to the CPU, seriously impacting switch performance, causing the CPU of the switch to spike, especially during peak hours.
Question 5
Question 6
Question 7
Explanation
In fact there are only three correct choices in this question but we listed here all four correct answers so that you can see which ones are not correct.
SDM templates are used to configure system resources in the switch to optimize support for specific features, depending on how the switch is used in the network. You can select a template to provide maximum system usage for some functions or use the default template to balance resources.
To allocate ternary content addressable memory (TCAM) resources for different usages, the switch SDM templates prioritize system resources to optimize support for certain features. You can select SDM templates to optimize these features:
+ Access – The access template maximizes system resources for access control 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 center of a network.
+ VLANs – The VLAN template disables routing and supports the maximum number of unicast MAC addresses. It would typically be selected for a Layer 2 switch.
In addition, the dual IPv4 and IPv6 templates enable a dual stack environment.
Question 8
Question 9
Question 10
Question 11
For question 4
” But in this case this switch is also used for routing..”
Where in the question it says that switch is used for routing?
question 4 is clearly saying that
LAN base feature set
and from https://blogs.cisco.com/enterprise/cisco-ios-software-licenses-what%E2%80%99s-what-for-layer-2-and-layer-3-switching-%E2%80%93-part-1
it sayes LAN base Feature is for L2 Switchs …….+
NO Routing is there
I believe the answer is D
it is a VLAN profile and the switch is working in a L2
Q11. What is the question?
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http://www.mediafire.com/file/qh4w6t52pav7db8/SWITCH_Feb_2018.pdf
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Q4.
In reference to Hmsh, February 6th, 2018 comment, no D but C is correct.
The question is clearly saying that LAN base feature set… then the VLAN template is working already, it not needs to be rebooted.
If the SDM template is causing CPU spike during peak working hours it means that the switch is used also for routing. The VLAN template disabled routing feature so all routing processing is sent to the CPU causing seriously impacting switch performance (and causing the CPU of the switch to spike during peak working hours). Correct is C.
I agree with Hmsh. Cisco document clearly states:
Do not select a routing template (sdm prefer routing) when the switch is running the LAN base feature set. Although visible in the command-line help, the LAN base feature set does not support routing. On switches running the LAN base feature set, routing values shown in the templates are not valid.
This means that routing is not possible on the switch, so the CPU spikes have to be caused by something other than routing ! Only switching remains and hence the option with a reboot makes the most sense to me.
Source:
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/12-2_53_se/configuration/guide/3750xscg/swsdm.html
@1WAY, yes, Q11 sounds stupid
Nataliya. Let me explain Q11, The Question is somewhat tricky but if you consider the question. it is already L2 (LAN Base Feature set) switch moved in to support both L2 and L3 environment (it default sdm template). so the cpu will generate spike due to some routing functionality of the switch.
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Quiz links not working?
Anonymous
April 30th, 2019
Quiz links not working?
– had the same problem when using firefox. worked in IE11 and Chrome.
Anyone have the latest files available? See user name for address
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Q4: You can still route with a VLAN SDM template, as it clearly states in the docs.
SDM reconfigures the ASICS to optimize switch performance. The VLAN template simply removes routing from hardware. That then requires all routing to be done in the processor, which is very intensive.
“When you use 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.”
Not ASICS, the database resources* hence the acronym.
I’d edit the previous comment if I could to correct my statement.
BTW, notice that for Cisco devices, you have to enable (e.g. IP CEF) or modify settings (e.g. SDM) to make the device not suck as bad and to enable it to compete with other vendor comparable devices.
Case in point: their firepower firewalls. Flakey, Frankenstein’d garbage at best.
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Quiz link doesn´t work
Q4
Well at least on my C3550, routing is *completely* disabled by the vlan template, not only in hardware.
SWC_C3550_24P(config)#sdm prefer ?
access multicast and qos/acl bias, drop unicast
extended-match Using extended match for unicast routing
routing unicast bias, drop qos/acl
vlan vlan bias, drop routing
SWC_C3550_24P(config)#sdm prefer vlan
Changes to the running SDM preferences have been stored, but cannot take effect
until the next reload.
Use ‘show sdm prefer’ to see what SDM preference is currently active.
NOTE: Use caution with ‘sdm prefer vlan’, as any current Layer3 configuration data
will not be saved after a reload.
*reload*
SWC_C3550_24P#conf t
Enter configuration commands, one per line. End with CNTL/Z.
SWC_C3550_24P(config)#ip routing
^
% Invalid input detected at ‘^’ marker.
SWC_C3550_24P(config)#
Perhaps this is not the case anymore with more recent stuff, if so C may be the only valid answer. Besides, I don’t know of any other template that would degrade CPU performance.
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q7
4 answers are correct, but the real question says choose three.
what do you do?
The switch supports an IP Base software image (with or without payload encryption) for customers without a service support contract. This image supports the IP Base and LAN Base feature sets.
LAN Base feature set—Provides basic Layer 2+ features, including access control lists (ACLs) and quality of service (QoS). Starting with Cisco IOS Release 12.2(58)SE, the LAN Base feature set also supports static IP routing on switch virtual interfaces (SVIs) for 16 user-configured routes.
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/15-0_2_se/configuration/guide/3750x_cg/swintro.html
Choosing the VLAN template will actually disable routing (number of entry for unicast or multicast route is zero) in hardware.
https://www.cisco.com/c/en/us/support/docs/switches/catalyst-3750-series-switches/44921-swdatabase-3750ss-44921.html
Q4 Answer C is correct!
A network engineer deployed a switch that operates the LAN base feature set and decides to use the SDM VLAN template
REGARDLESS IF IT DISABLES HARDWARE BASED ROUTING 10% 50%, 70% OR 100%, the fact remains that it does in fact reduce routing in hardware and pushes it to the CPU.
C is correct no matter how you look at it. SDM VLAN tells ASICS to only look at increase VLAN performance. Routing then has to go somewhere. It goes to the CPU!!
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