Shared Flashcard Set

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MPLS
CCIE R&S
81
Computer Networking
Not Applicable
06/25/2013

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Cards

Term
What does LDP stand for?
Definition
Lable Distribution Protocol
Term
What command is used to see the LDP neighbors?
Definition
sh mpls ldp neighbors
Term
What command is used to see the mpls label that is assigned to routes?
Definition
sh mpls ldp bindings
Term
What does PE stand for?
Definition
Provide Edge
Term
What is it called when a label is put onto a route?
Definition
Push
Term
What is it called when a label is removed and replaced?
Definition
Swap
Term
Which router will Push a label?
Definition
PE or Provider Edge router
Term
Which router will swap a label?
Definition
P or Provider router
Term
What does a P router stand for?
Definition
Provider
Term
What does LSR stand for?
Definition
Label Switched Router
Term
This router will receive a labeled packet and remove it before forwarding it
Definition
Egress LSR
Term
What is it called when a label is removed off a route?
Definition
POP
Term
An LSR that pushes labels onto a packet first is called?
Definition
Imposing LSR
Term
Which router will do the Imposing?
Definition
Ingress Router
Term
An LSR that removes all labels from a route is called?
Definition
Disposing LSR
Term
Which router will do the Disposing?
Definition
Egress LSR
Term
What does LSP stand for?
Definition
Label Switched Path
Term
The sequence of LSRs that switch labeled packets through the MPLS network is called?
Definition
Label Switched Path
Term
what is the first and last router called in the LSP?
Definition
First = ingress
Last = egress
Term
All routers in between the ingress and egress routers are called?
Definition
P routers or Intermediate routers
Term
What is it called to have a LSP inside another LSP
Definition
Nested LSP
Term
What does FEC stand for?
Definition
Forwarding Equivalence Class
Term
What does TDP stand for?
Definition
Tag Distribution Protocol
Term
What does RSVP stand for?
Definition
Resource Reservation Protocol
Term
Name all the Label protocols
Definition
TDP
LDP
RSVP
Term
What label protocol is Cisco proprietary?
Definition
TDP
Term
What does TE stand for?
Definition
Traffic Engineering
Term
What protocol is for for TE?
Definition
RSVP
Term
What does LIB stand for?
Definition
Label Information Base
Term
When a router receives label information for its neighbor, this is called
Definition
remote binding
Term
When there are multiple remote bindings for a prefix, which label is chosen?
Definition
the label that correspond to the next-hop of that prefix which is determined by the IGP
Term
what does LFIB stand for?
Definition
Label Forwarding Information base
Term
What builds the LFIB?
Definition
the incoming and outgoing labels for the LSP
Term
the LFIB using what table to build it's information?
Definition
LIB
Term
how many labels will the LFIB use when the LIB has multiple labels for a prefix?
Definition
One
Term
if a router receives a IP packet and forwards it with a label, this is called?
Definition
IP-to-Label forwarding
Term
if a router receives a labeled packet and forwards it as IP, this is called?
Definition
Label-to-IP forwarding
Term
what command is used to see the local MPLS forwarding?
Definition
sh mpls forwarding-table
Term
list all the possible label operations
Definition
Pop
Swap
Push
No label
Aggregate
Term
throughout a LPS, one of the routers does not have MPLS enabled on it. What method will be use?
Definition
IP
Term
What will a router advertise to it's neighbor if the neighbor needs to pop the label?
Definition
Implicit Null
Term
Where is the MPLS TTL implemented from?
Definition
The IP Header
Term
What happens to the Frame when a label is added to a full MTU frame?
Definition
It becomes a giant frame
Term
What will MPLS do is the payload is bigger than the MTU?
Definition
Fragments the IP packet
Term
How does MPLS fragment?
Definition
It strips off the label, fragments the IP packet, and relabels all fragmentrs with the same label.
Term
When will MPLS not fragment?
Definition
If the DF bit is set in the IP header
Term
A Router sends a packet and receives an error that "Fragmenting is needed". The router then lowers the MTU and resend. What is this called?
Definition
Path MTU Discovery
Term
What does LIB use to propagate its database? Name all of them
Definition
LDP
RSVP
MP-BGP
Statically configured Bindings
Term
What does MP_BGP distributes labels for?
Definition
BGP routes
Term
What does RSVP distributes labels for?
Definition
Traffic Engineering
Term
how are LDP neighbors find each other?
Definition
Hello Messages
Term
Does LDP use UDP or TCP?
Definition
TCP
Term
what must be enabled in order for MPLS to work?
Definition
CEF
Term
what command is used to turn on LDP?
Definition
mpls ip
Term
what command is used to set the MPLS label protocol to LDP?
Definition
mpls label protocol ldp
Term
What command do you use in order to see the label for a specific route?
Definition
sh ip cef "prefix"
Term
what port number does LDP use?
Definition
646
Term
What multicast address does LDP use?
Definition
224.0.0.2
Term
how often is LDP hello messages sent?
Definition
every 5 seconds
Term
Which router will initiate the TCP session for LDP?
Definition
The router with the highest router-id
Term
The router that initiates the TCP session for LDP is called?
Definition
the Active LSR
Term
Are LDP hello messages UDP or TCP?
Definition
UDP
Term
What command do you use to see the Hello and hold times of LDP? name two
Definition
sh mpls ldp discovery detail

sh mpls ldp parameters
Term
what command will show you what interfaces are running mpls?
Definition
sh mpls interfaces
Term
what command is used to change the LDP hold timers?
Definition
mpls ldp holdtime
Term
what is the default LDP hold time?
Definition
15 seconds
Term
what command do you use to change the LDP holdtime
Definition
mpls ldp discovery hello holdtime
Term
what is the command to change the mpls hello timer?
Definition
mpls ldp discovery hello interval
Term
what command is used to change the LDP router-id?
Definition
mpls ldp router-id
Term
what command do you use to change the LDP router-id immediately
Definition
mpls ldp router-id force
Term
what command is used to change the LDP keepalives
Definition
mpls ldp holdtiume
Term
what command do you use to change the ip address that is used in the LDP session?
Definition
mpls ldp discovery transport-address
Term
With Frame Relay, how many LDP sessions are need for multiple Interfaces?.
Definition
One
Term
With ATM, how many LDP sessions are need for multiple Interfaces?.
Definition
One per interface
Term
what command do you used to set up LDP sessions with non-directly connected routers?
Definition
mpls ldp neighbor targeted
Term
What command is used to change the targeted hello and holdtimers?
Definition
mpls ldp discovery targeted-hello
Term
what command is use to authenticate LDP sessions?
Definition
mpls ldp neighbor "ip address" password
Term
what command is used to control labels that are being advertised?
Definition
mpls ldp advertise-labels
Term
what is the maximum cost value of OSPF?
Definition
65535
Term
what is the maximum cost value of OSPF?
Definition
65535
Term
what command is use to protect LDP session?
Definition
mpls ldp session protected
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