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SDM Questions

November 27th, 2018 in SWITCH 300-115 Go to comments

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.

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/release/12-2_55_se/configuration/guide/scg3750/swsdm.html

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.

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/release/12-2_55_se/configuration/guide/scg3750/swsdm.html

Question 8

Question 9

Question 10

Question 11

Comments
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    February 4th, 2018

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  2. Andre
    February 5th, 2018

    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?

  3. Hmsh
    February 6th, 2018

    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

  4. 1WAY
    February 12th, 2018

    Q11. What is the question?

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    February 14th, 2018

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  7. hallfawi
    February 28th, 2018

    dears, is this topic will be included in the exam?

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    March 16th, 2018

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  9. Test
    April 13th, 2018

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  10. lalaversa
    May 12th, 2018

    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.

  11. Raito
    June 7th, 2018

    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

  12. nataliya
    June 13th, 2018

    @1WAY, yes, Q11 sounds stupid

  13. chuba
    July 31st, 2018

    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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    August 11th, 2018

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    February 2nd, 2019

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    February 18th, 2019

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    February 28th, 2019

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    March 12th, 2019

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    April 30th, 2019

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    May 2nd, 2019

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    April 30th, 2019

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    July 31st, 2019

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  27. Anonymous
    September 10th, 2019

    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.”

  28. Anonymous
    September 10th, 2019

    Not ASICS, the database resources* hence the acronym.

    I’d edit the previous comment if I could to correct my statement.

  29. Anonymous
    September 10th, 2019

    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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    October 12th, 2019

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  31. Anonymous
    October 14th, 2019

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  32. Burìk
    November 8th, 2019

    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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    November 15th, 2019

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    December 10th, 2019

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