ccna example questions and answers

ccna example questions and answers

Priority 2 : 9375000 Mpls traffic-eng tunnels mpls label range 200 299 !! The maximum reservable bandwidth is 75M Run the interface configuration command: isis metric value level-1 | level-2 to configure the metric on the same interface. R1.00-00 Network 10.1.12.1 0.0.0.0 area 0 *Aug 18 11:26:02.546: The main function of the ES-IS protocol is to provide mapping of NSAP addresses to SNPA addresses for network devices . 10.1.34.0/24 *Aug 18 09:06:07.919: EXPLICIT_ROUTE type 1 length 68: [T] 403 Type 1 length 8 : Mpls traffic-eng router-id loopback0 mpls traffic-eng area 0 The configuration of R2 is supplemented as follows: Network 10.1.12.1 0.0.0.0 area 0 Periodic reoptimize Router-id 3.3.3.3 In order for the protection feature to work properly, you need to enable this feature on both LSRs . If one end does not support this feature, you can configure the feature in one segment and the mpls ldp discovery targeted-hello accept command on the other end to receive target-hello . *Aug 18 09:06:07.919: Tun Dest: 5.5.5.5 Tun ID: 0 Ext Tun ID: 1.1.1.1 Interface Tunnel0 PATH Ip vrf forwarding VPN-A Net 49.0001.0000.0000.0001.00 12 Local binding: tag: 103 !! Locally assigned label for prefix 3.3.3.3/32 The PATH message is sent to the end of the hop by one hop; the RESV message is sent to the headend router in the opposite direction. Active 10.1.56.5 [MPLS: Label 505 Exp 0] 8 msec 0 msec 0 msec IS-IS IGP metric: 1 Router ospf 1 Data plane : Data forwarding based on tags Interface eth0 1/0 The maximum number of regional addresses configured by a single router must be the same as that of neighboring neighbors. By default, CISCO IOS routers support the maximum number. *Aug 18 11:31:44.598: Minimum Path Bandwidth (bytes/sec): 1250000 ES Interface fas0/0 Interface fas0/0 R1 , R2 , R3 , and R4 are in Transit AS 1234 . The IGP protocol running in the AS is OSPF. Ip rsvp bandwidth 2000 This command sets the total reservable bandwidth of the interface to 2M. Then the LSR pushes the IP packet into a tag header, tags 204 , and forwards it out from the F0/0 interface. In CISCO IOS , CEF switching is the only IP forwarding mode that can be used to mark messages . Therefore ,ccna example questions and answers, CEF must be enabled on the router when MPLS is enabled . This can be area at any level within the router adjacency relationship; may be other area adjacent L2 or L1 / L2 router forming L2 Token bucket fragment (service_id=1, length=6 words parameter id=127, flags=0, parameter length=5 *Aug 18 11:31:44.598: Pop tag Bandwidth: 2000 Requirements for IGP Next, R1 calculates another alternative path to R7 through the existing information : R1-R2-R4-R5-R7 , this path passes CSPF 130 R2.00-00 [5]: 75000 kbits/sec Ip address 10.1.45.4 255.255.255.0 R3 found that the inbound tag 300 's tag package, the outbound tag is a POP , so he pops the top tag (actually a layer), and then directly throws the popped data to 10.1.34.4 , note that this time it does not need Find the FIB table again because there is already a next hop in the LFIB table. Eventually this data was passed to R4 . 75000 130 Next Hop *Aug 18 09:06:07.919: version=0 length in words=10 OSPF adjacency does not DOWN , then R1 routing table, about 3.3.3.3/32 still choose R2 as the next hop, this is a problem. In the LFIB on R1 , the entry for 3.3.3.3/32 might look like this: To add: In the above environment, the loopback interface cost=1 , and the cost of all other physical interfaces =10 . Then if we configure: BandwidthOverride: disabled LockDown: disabled Verbatim: disabled View bandwidth's Thresholds O bit Not supported yet The distribution of the label is like this: *Aug 18 04:37:06.239: version=0, length in words=7 Mpls traffic-eng tunnels mpls ip Bytes tag switched If you want the penultimate hop router to recognize the "explicit empty tag" advertised by the tail router as "explicit empty tag", then you can 10.1.23.2 All routers in a zone must have the same zone ID 10.1.45.0/24 Reservable Bandwidth[0]: Type 1 length 12: *Aug 18 04:37:06.243: RSVP path maintenance and removal *Mar 1 00:00:32.763: ISIS-Upd: full SPF required 4.4.4.4/32, version 12, epoch 0, cached adjacency 10.1.12.2 Set-overload-bit Downstream on Demand max hop count: 255 Downstream on Demand Path Vector Limit: 255 LDP for targeted sessions ! The initial configuration is as above. In the current environment, R1 does not activate fastreroute , and R2 does not deploy a protective tunnel . First, in R1 the debug ip rsvp dump-messages We spotted FIG, C for 30.0 / 24 bundled label prefix 0 , i.e. explicit null label, the label is then sent to map B , B also generates its own tag map is then sent to A . Then, at this time, if B receives a label packet from A and the value of the top label is 20 , then B finds its own LFIB and finds that the label is to be converted to 0 . Therefore, B replaces the top-level label with 0 and then forwards it to C. At this time, for C , it receives a label packet with a label value of 0. C cannot forward the label value 0 in the LFIB . Message, because this tag value can be assigned to multiple FECs , C just pops up 0The tag is also an explicit null tag. After that, another search has to be performed. Although the search has to be performed twice, C can obtain the QoS information of the packet by looking at the EXP bit of the tag header .