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GLBP Questions 2

November 15th, 2018 in SWITCH 300-115 Go to comments

Question 1

Explanation

With GLBP, up to four gateways can be used simultaneously -> A is correct.

The GLBP group weighting can be automatically adjusted by tracking the state of an interface within the router. If a tracked interface goes down, the GLBP group weighting is reduced by a specified value. Different interfaces can be tracked to decrement the GLBP weighting by varying amounts -> E is correct.

Question 2

Question 3

Question 4

Explanation

When the routers are configured to a GLBP group, they first elect one gateway to be the Active Virtual Gateway (AVG) for that group. The election is based on the priority of each gateway (highest priority wins). If all of them have the same priority then the gateway with the highest real IP address becomes the AVG. The AVG, in turn, assigns a virtual MAC address to each member of the GLBP group. Each gateway which is assigned a virtual MAC address is called Active Virtual Forwarder (AVF). A GLBP group only has a maximum of four AVFs. If there are more than 4 gateways in a GLBP group then the rest will become Standby Virtual Forwarder (SVF) which will take the place of a AVF in case of failure.

Comments
  1. MrK
    December 14th, 2018

    Don’t think F is the answer to Question 3:

    Question 3

    A question related to FHRP defaults.
    A. Preemption is enabled
    B. Only GLBP use load-balancing for multiple router
    C. Only GLBP use MAC address router BIA (Burned In Address)
    D. Only if the AVG fail, standby become the new active router
    E. If standby router has higher priority it becomes the new active router
    F. If standby AVG has higher priority it becomes the new active router
    G. Something on or about VRRP

    By default, the GLBP gateway preemptive scheme is disabled. A backup virtual gateway can become the AVG only if the current AVG fails, regardless of the priorities assigned to the virtual gateways.

    Best Answer is: D. Only if the AVG fail, standby become the new active router

    Source:
    https://www.cisco.com/en/US/docs/ios/12_2t/12_2t15/feature/guide/ft_glbp.html#wp1039649

  2. trueteller
    December 29th, 2018

    @MrK
    In GNS3 I have tested scenario where I had connected 4 L3 switches with one GLBP group. All of them had the same priority. Switch that had highest IP address (SW4) on the interface became AVG. Remember that preeption is disabled by default. I have added SW5 with highest IP address and connected it to rest of them. Then this switch instantly became AVG.
    This might be a glitch in GNS3 however this shouldnt happen as far as I know.

    This actually proves that F could be correct but I cannot believe it 100% sure. That would be nice if somebody could check this with real equipment.

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  4. pepito grillo
    January 13th, 2019

    indeed, question 3 is for sure D, as preemption is not enabled BY DEFAULT on glbp avg election.

  5. @youssouf
    February 2nd, 2019

    In EVE I have tested scenario where I had connected 4 ROUTER with one GLBP group. All of them had the same priority(100). Switch that had highest IP address ROUTER-4 on the interface became AVG. I have added ROUTER-5 with highest IP address and configured priority 150 (has higher priority) connected it to rest of them. Then this switch instantly became standby.
    Best Answer is: D. Only if the AVG fail, standby become the new active router

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