ccna dump questions
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Since the IP packet is generated on the initial router, the CEF table is searched . With the " show ip cef detail " command, you can see from the output whether the route is pushed into the label. The distribution label is based on The prefix in the CEF table is assigned.
Tag rewrite with Fa0/0, 10.1.12.2, tags imposed: {203}
55.55.55.55 [110/31] via 10.1.23.3, 00:03:44, Ethernet0/1
Route-map test permit 10 router isis
*Aug 18 09:06:07.919: IS Hops:1
10.1.35.55 -> 1.1.1.1 : FastEthernet0/0 (next hop 10.1.23.2)
Network 10.1.23.2 0.0.0.0 area 0
Mlps ldp neigbor [vrf vpn-name] ip-addr password [0-7] pswd
Hello
Local binding: tag: imp-null
How long in msecs to wait upon flooding a down forwarding adjacentcy
R2#show mpls traffic-eng tunnels
Ciphertext interface authentication
Peer LDP Ident: 3.3.3.3:0; Local LDP Ident 2.2.2.2:0 TCP connection: 3.3.3.3.62244 - 2.2.2.2.646
*Aug 18 09:06:02.699: Token bucket fragment (service_id=1, length=6 words
R3#show mpls forwarding-table
!
OSPF , this is not the same as other IGP protocols. Therefore, if you want to make the routing full, you need to add a re-release directly to R3 .
539
Virtual link
Tunnel mpls traffic-eng autoroute announce tunnel mpls traffic-eng priority 7 7
Debug ip rsvp dump-messages
!! The outbound label is 301
Of course, if you are running in a single zone, you can use a full L1 router or a full L2 router solution.
Local binding: tag: 100
Flowspec
The LSP overload-bit generated by this router is set. This will cause the router to not be used by other routers as the next hop to any destination, except for its locally connected network segment. This is generally used when the router is a leaf node, that is, the end of the network, directly connected to the user.
Ip address 10.1.123.3 255.255.255.0
When the LAN interface activates IS-IS , the router immediately sends IIH , where IIH contains a LANID , which is displayed in the message as
( NLPID 0x81 ) and IP ( 0xCC )
Mpls traffic-eng tunnels ip rsvp bandwidth
Interface eth 0/0
Mpls traffic-eng tunnels mpls label range 400 499
Et0/0
Ip cef
MPLS TE traffic forwarding
LSP midpoint frr information: LSP identifier
Router-id 4.4.4.4
Type escape sequence to abort. Tracing the route to 4.4.4.4
Version = 0 length in words = 7 service id = 5, service length = 6
The configuration of R1 is as follows:
R1.00-00
Reservable Bandwidth[3]:
There is a difference between the two
Protocol overview
R2-PE1#show ip route
One goes from tunnel0 , cost=1000+1=1001 one goes from eth0/1 , cost=10+10+10+1=31
Generating a pseudo-node, node action by the pseudo-elections DIS play
Network 1.1.1.1 0.0.0.0 area 0
Mpls traffic-eng tunnels ip rsvp bandwidth
LDP ID election is the same as OSPF routerID
Mpls traffic-eng router-id loopback0 mpls traffic-eng area 0
!
Net 49.0001.0000.0000.0002.00
LIB tag information base
R4 the loopback port) of the OSPF Metric =. 3 , so the default TE metric = 3
Interface Loopback0
i*L1 0.0.0.0/0 [115/10] via 10.1.123.3, FastEthernet0/0
55.55.55.55 [110/2] via 0.0.0.0, 00:00:01, Tunnel0
Bytes tag switched
Interface fast0/0
40s , and in order to establish an adjacency relationship, the holding time of both parties must be consistent.
Network 1.1.1.1 0.0.0.0 area 0
Certification Information
1112
0 kbits/sec
LIB tag information base
Router-id 5.5.5.5
Mpls ldp igp sync holddown 5000
R3 is a passive session recipient.
BGP routing problem, well, now we use the loopback interface on R1 and R4 to establish IBGP adjacency, the problem is solved. At this time R4 , the go 5.5.5.5 next hop of the R1 of Loopback port addresses, R4 at destined to 5.5.5.5 of the IP when the pressure package label, use is 1.1.1.1/32 routing tag, The same is true for R3 and R2 , then the label package can be opened through 1.1.1.1/32 .
For a router that supports IPv6 , the algorithm for performing load balancing on MPLS packets is as follows:
Now the initial environment, R1 can learn inter-area routes, and R2 locally re - routes to level 1 route 2.2.2.0 . Of course, since R2 sets the attached-bit , R1 also generates a default route to R2 .
Router ospf 1
[Note] If the router receives a tagged packet and the top tag cannot be found in the local LFIB , the CISCO IOS will discard it.
If the router performing load balancing is the inbound LSR of the IP packet ,ccna dump questions, then it is easy to know that the received IP packet is IPv4.
Network 10.1.12.1 0.0.0.0 area 0
10.1.12.2
The configuration of R6 is as follows:
*Aug 18 09:06:07.919: 10.1.12.1 (Strict IPv4 Prefix, 8 bytes, /32)
The PATH message is delivered from the headend router to the following router, then the next hop router will remove its own IP from the ERO .
Record Route: NONE
The OSPF adjacency cannot be established, but R1 has only one available path to reach R2 , so OSPF adjacency is established unconditionally. At the same time, R1 and R2 will directly announce the 10.1.12.0/24 direct link, which will be advertised with the largest metric 65535 . The purpose of this is that if the network environment is a redundant link environment, then the metric of the link can be made the worst from the perspective of the IGP , so that the LDP path bypasses the link.
