CCNP switch slides 14 Flashcards
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http://www.coursehero.com/flashcards/430757/CCNP-SWITCH-642-813-High-Availability/
What is the command to view HSRP information on a device?
show standby
What is the hello timer in VRRP?
1 second.
What is the number range that can be assigned to HSRP groups?
0-255, but most switches only support up to 16.
What happens if two switches have the same HSRP priority values within a group?
The switch with the highest IP address takes over the active state.
What is the default GLBP MAC address scheme?
0007.b4xx.xxyy where xx.xx is the hex group-id and yy is the AVF number.
What are the three load-balancing methods used by GLBP and what is the default method?
Round-robin (default!), Weighted, and Host Dependent.
What is the default key-string used with HSRP devices?
‘cisco’
What are the three states that a Switch running HSRP can end up in?
Active, Standby, and Listen.
What are the fail-over times for the following redundancy modes: RPR, RPR+, SSO?
-RPR >2minutes-RPR+ >30seconds-SSO >1second
What is the range for an HSRP Priority value, what is the default, and what values are better?
0-255, default is 100, and higher values are better.
Can you preempt in GLBP?
Yes!
What two conditions MUST be met for another switch to take over the active role in HSRP?
-The switch must have a higher HSRP priority.-The switch must use the preempt command.
What is the default hello and hold-down timers for HSRP and what are the ranges for these values?
The default hello is 3 seconds, and the default hold-down is 10 seconds. The hello timer can range from 1-254 seconds or 15-999 milliseconds, and the hold-down timer can range from 1-255 seconds or 50-3000 milliseconds.
What are the three ways that HSRP can authenticate message exchanges?
-Plain-text authentication strings-MD5 key-strings-MD5 key-chains
What command allows an HSRP switch to immediately take over the active role, and in what ways can you delay this process?
The Preempt command, and you can give a minimum delay of 0-3600 seconds, or the reload delay of 0-3600 seconds.
When it comes to switch redundancy, what is NSF?
Non-Stop Forwarding. It is a method that focuses on rebuilding the Routing Information Base after a supervisor switch-over.
Can you track interfaces with GLBP?
Yes!
Why is no subnet given when assigning a standby address?
-Because the standby address must belong to the same IP subnet as the primary address.
What First Hop Redundancy Protocols are Cisco Proprietary?
HSRP and GLBP
Where must you explicitly configure the IP address on an GLBP group?
On the device you want to be the AVG.
What are the three types of First Hop Redundancy Protocols?
-HSRP, Hot Standby Router Protocol-VRRP, Virtual Router Redundancy Protocol-GLBP, Gateway Load Balancing Protocol
What does the track command do in HSRP and what is the default value of this action?
It monitors another interface, and if that interface should fail, it will decrease the HSRP group priority value by a default of 10.
What routing protocols are supported by NSF?
-BGP, EIGRP, OSPF, IS-IS
How does Preempt work on VRRP?
All VRRP devices are configured to automatically preempt if they have a higher priority.
Can HSRP groups with the same group-id exist on the same VLAN? How about different VLANs?
HSRP groups must be unique WITHIN a VLAN. Different VLANS can use the same group-ids without any problems.
What is the range and default value of the VRRP priority?
1-254, default is 100.
In GLBP, what are devices that have one of the 4 virtual MAC addresses called?
AVF - Active Virtual Forwarders.
What is the weight range and default value in GLBP?
1-254, and defaults to 100.
What are the three redundancy modes used on Catalyst switches with more than one supervisor?
-RPR(Route Processor Redundancy ->Cold standby)-RPR+(Route Processor Redundancy+ ->Warm standby)-SSO(Stateful Switch Over ->Hot standby)
In GLBP what is used to determine if a device will become the AVF for a group?
The Weight function.
In GLBP, what happened to timer value changes when placed on the AVG?
They will propagate to all other devices in the GLBP Group.
What are the 6 HSRP negotiating states?
- Disabled2. Init3. Listen4. Speak5. Standby6. Active
What is the MAC address for VRRP interfaces?
0000.5e00.01XX Where XX is the hex value of the VRRP group-id.
Will changes on a single switch’s HSRP timers affect other HSRP switches in the same group?
No, times must be configured on each switch manually!
Can you track another interface in VRRP?
Nope.
What is the job of the AVG in GLBP?
The AVG responds to ARP requests from clients to their default gateway with a unique MAC response in order to load balance across the network.
In GLBP devices use the same ___ address, but have different _____ addresses.
IP, MAC
What is the default MAC address for HSRP gateways?
0000.0c07.acXX where XX represents the hex value of the HSRP group-id.
What is the command to show VRRP information on a device?
show vrrp
How many virtual MAC addresses can be used in a GLBP group?
4
What are the default hello and hold-down timers with GLBP, and their ranges?
-Hello timer default is 3 seconds, and ranges from 1-60 seconds or 50-60000 milliseconds.-Hold-down defaults to 10 seconds, and ranges from 1-180 seconds or 150-180000 milliseconds.
What are the ranges and default values of GLBP group numbers and device priorities?
Group numbers range from 0-1023, and priorities range from 0-255 with 100 being the default. Higher is better.
What are the two device states in VRRP?
Master and Backup
In a GLBP group, how does a device get elected as the AVG? And what is an AVG?
The device must have the highest priority value, or the highest IP address in the event of a tie. AVG = Active Virtual Gateway.
