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CCNP > Ch. 5 - VLAN Trunks & EtherChannel > Flashcards

Ch. 5 - VLAN Trunks & EtherChannel Flashcards

1
Q

What is VTP?

A

Vlan Trunking Protocol - mechanism to provision VLANs on many switches

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2
Q

List all the different VTP roles

A

1) Server
2) Client
3) Transparent
4) Off

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3
Q

What is a VTP server?

A

Allowed to create, modify, delete VLANs within a VTP domain

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4
Q

What is a VTP client?

A

Modifies its own VLANs based on received VTP adverts. Local VLAN configuration is disabled.

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5
Q

What does the Transparent VTP role do?

A

Only forwards VTP adverts it receives, does not change its own VLAN DB

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6
Q

What does the Off VTP role do?

A

Does not participate in VTP, does not forward adverts

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7
Q

What type of traffic does VTP use for its advertisements?

A

Multicast

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8
Q

A switch that connects to the VTP domain must have what done? Why?

A

Its VTP revision # must be reset to 0.

If it joins the VTP domain with a different (higher) revision # than the current switches, its VLAN DB may propagate to the other switches

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9
Q

What is DTP?

A

Dynamic Trunking Protocol - Cisco-proprietary mechanism for switch ports to dynamically form a trunk port

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10
Q

Switches __________ when using DTP to see if they can form a trunk port.

A

send DTP packets

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11
Q

What are the different DTP modes?

A

1) Trunk
2) Dynamic desirable
3) Dynamic auto

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12
Q

What is the DTP trunk mode?

A

This statically assigns a port as a trunk, and have it advertise DTP packets

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13
Q

What is the dynamic desirable mode?

A

The port acts as an access port but listens for and advertises DTP packets

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14
Q

What is the dynamic auto mode?

A

The port acts as an access port, but ONLY listens for DTP packets

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15
Q

What command would you use to prevent a static trunk port from forming a trunk with a dynamic desirable or dynamic auto port?

A

switchport nonegotiate

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16
Q

What is an EtherChannel bundle?

A

2 or more ports logically acting as one to provide: 1) increased bandwidth and 2) load balancing

17
Q

What are two main ways to set an EtherChannel bundle (not specific protocols)?

A

Statically or by using a dynamic link aggregation protocol

17
Q

What IEEE standard specifies link aggregation?

A

802.3AD, also known as “port channel”, “EtherChannel”

18
Q

What is the downside of statically assigning an EtherChannel bundle?

A

There are no built-in health checks

19
Q

What are the main dynamic link aggregation protocols?

A

1) Port Aggregation Protocol (PAgP), Cisco proprietary
2) Link Aggregation Control Protocol (LACP), open standard

20
Q

What are the different modes for PAgP?

A

1) Auto: does not advertise PAgP packets, but will establish adjacency if it receives them
2) Desirable: transmits PAgP packets, and forms adjacency w/remote ports set to “auto” or “desirable”

21
Q

What are the different modes for LACP?

A

1) Passive: does not advertise LACP packets, but will establish adjacency if it receives them
2) Active: transmits LACP packets, and forms adjacency w/remote ports set to “auto” or “desirable”

22
Q

What are 4 LACP settings to remember?

A

1) Minimum number of interfaces
2) Max # of member interfaces
3) System priority
4) Port priority

23
Q

How do you set the minimum # of interfaces for LACP?

A

“port-channel min-links [min #]”

24
Q

In LACP, what happens if a bundle does not have the minimum # of links active?

A

The bundle is set to “not in use”

25
Q

How do you set the maximum # of member interfaces for LACP?

A

“lacp max-bundle [# of links]”

26
Q

With LACP, what happens when a bundle has more than the max # of member interfaces?

A

Any port over the max will be in hot standby

27
Q

How do you set the system priority for LACP?

A

“lacp system-priority [# prio]”W

28
Q

What does setting the system priority do in LACP?

A

Switch with the lower system priority decides which member interfaces are active when there are more than the maximum amount

29
Q

How do you set the interface priority for LACP?

A

“lacp port-priority [prio #]”

30
Q

What does setting the port priority do in LACP?

A

Determines which interfaces on the primary switch will be active, when there are more member interfaces than the maximum

31
Q

When there is an issue with EtherChannel, what is something to check?

A

That all member interfaces have the same settings

  • Verify LACP,PAgP packet transmission/receipt and counters
32
Q

What does EtherChannel use for load balancing?

A

It calculates a hash, packets are consistently forwarded across a link based on that hash

33
Q

What command would you use to change the hash value for EtherChannel?

A

“port-channel load-balance [hash]”

34
Q
A

CCNP (7 decks)

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