Routing Flashcards
configure router subinterface
- i.e. interface f-/0.10
- encapsulation dot1q 10
- ip and mask
configure static route
ip route network-address mask {ip | exit interface}
default route
static routed used w/ bits matching
configured as 0.0.0.0 0.0.0.0
configure RIP
#router rip #network *ip address*
RIP troubleshooting commands
show ip route
show ip protocols
show ip rip
switch router to RIPv2
#router rip #version 2
enable VLSM for RIPv2
no auto-summary
EIGRP
- distance vector
- classless
- cisco proprietary
- RTP
- bounded updates
- diffusing update algorithm (DUAL)
- establishing adjacencies
- neighbor and topology table
EIGRP TLV types (type/length/value)
0x0001 EIGRP parameters
0x0102 IP internal routes
0x0103 IP external routes
Opcode in EIGRP header
specifies EIGRP packet type
AS # in EIGRP packet header
specifies antonymous system # since multiple EIGRP instances can be run
5 EIGRP packet-types
- hello
- update
- acknowledgement
- query
- reply
configure EIGRP summary route
enter interface config mode
ip summary-address eigrp as-# network# mask
command to include static route in routing updates
redistribute static
command to modify bandwidth metric on EIGRP interface
bandwidth speed in kilobits
3 tables useful for troubleshooting EIGRP
- routing table
- neighbor table
- topology table
sucessor
neighboring router used for packet forwarding and is the least-cost route to the destination network
feasible distance
lowest calculated metric to destination network
feasibility
met when neighbors reported distance to a network is less than the local routers FD to the same network
OSPF
Open Shortest Path First
- link state protocol
- open standard
5 OSPF packet types
-hello
-DBD (database description)
-LSR (link-state request)
-LSU (link-state update)
LSAck (link state acknowledgement)
OSPF hello packets
- discover OSPF neighbors & establish adjacencies
- advertise parameters on which 2 routers must agree to become neighbors
- elect the designated router & backup designated router on multiaccess networks
matching interface values required for OSPF adjacency
- hello interval
- dead interval
- network type
designated router
- responsible for updating all other OSPF routers on a multi-access network
- router w/ highest OSPF interface priority is chosen
- 2nd highest is backup designated router