Home > HSRP Questions 4

HSRP Questions 4

November 15th, 2019 Go to comments

Question 1

Question 2

Explanation

This HSRP MAC address is a virtual MAC address, 0000.0C07.ACxy, where xy is the HSRP group number in hexadecimal based on the respective interface. 25 in hexadecimal is 37 in decimal.

Question 3

Question 4

Question 5

Question 6

Question 7

Question 8

Question 9

Comments
  1. jVIZ
    January 13th, 2020

    Q5

    @FeasibilityFreak Looks like it’s enabled by default on IOS 15.4 anyway, this must be what they are referring to
    “By default, HSRP filtering of Internet Control Message Protocol (ICMP) redirect messages is enabled on devices running HSRP.”

    https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipapp_fhrp/configuration/15-mt/fhp-15-mt-book/fhp-hsrp-icmp.html

  2. jjones
    February 9th, 2020

    Q7

    R2 would not work since Gi0/0’s IP is not in the same network as the standby virtual IP

  3. hyperoxyd
    February 10th, 2020

    Q3
    Answers for this questions aren’t worded correctly for HSRP

    HSPR v1 and 2 both use the multicast address of 224.0.0.2 (not .102)
    C. GLBP uses the multicast IP address of 224.0.0.102. – correct
    D. VRRP uses the multicast IP address of 224.0.0.18 with IP protocol 112. – correct

  4. hyperoxyd
    February 10th, 2020

    @hyperoxyd Q3

    correcting my mistake – looks like HSRPv2 and GLBP use the same multicast just a different port.

    HSRP v1 uses UDP port 1985, multicast address is 224.0.0.2
    HSRP v2 uses UDP port 2029, multicast address 224.0.0.102
    GLBP uses UDP port 3222, multicast address is 224.0.0.102
    VRRP uses IP protocol 112, multicast address is 224.0.0.18

  5. Raspasoti
    February 19th, 2020

    I think Q8 is wrong, as far as I know HSRP can NOT perform load-balancing, however, it can perform load sharing, but thats is a different thing.

  6. Anonymous
    June 9th, 2024

    By default, which virtual MAC address does HSRP group 25 use?

  1. No trackbacks yet.