ccna prep questions

ccna prep questions

PSNP CSPF algorithm overview LSPID Router(config)#Ip cef Configuration change A pseudonode represents a broadcast multi-access network (including all ISs connected to this LAN ), which actually "as a router" (above, gray router) in the network. In other places, this is a whole. So does this whole have to generate an LSP ? This LSP is generated by the DIS . Set-overload-bit on-startup <5-86400 sencondes> *Aug 18 09:06:02.699: SESSION_ATTRIBUTE type 7 length 16: Lists the list of directly connected IP address prefixes Ip explicit-path name R2R4R5 enable next-address 10.1.12.2 Duration refers to the time required to obtain continuous protection (based on the target LDP session ) after the LDP link adjacency is DOWN . The default is permanent. Tunnel mpls traffic-eng path-option 10 explicit name R1toR5 To form an adjacency relationship. R2#sh isis neighbors Parameters: *Aug 18 09:06:07.919: peak rate =250000 bytes/sec R3.00-00 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. 10.1.23.0/24 *Aug 18 04:37:06.239: Area-password cisco i L2 2.2.2.0 [115/20] via 10.1.24.2, Serial0/0 Reservable Global Pool BW: 75000 kbits/sec In CISCO IOS , a re-optimization of a TE tunnel is done every 1 hour by default . The router that determines which FEC the message belongs to is the inbound LSR because it classifies and pushes the message into the label. Interface eth0 0/0 Then, finally, the data is introduced into the established tunnel . In fact, after creating a TE tunnel on R1 , a local tunnel is in it. Then by default, R1 goes to .5.5.5.5 and 55.55.55.55 is definitely preferred from E0/1 directly to R5 . But what if we want R1 to go to TE tunnel on .5.5.5.5 and 55.55.55.55 traffic ? Terminal system ES OSPF Router with ID (2.2.2.2) (Process ID 1) Router Link States (Area 0) Interface R2#sh run | The TTL is placed in the label header. Turning off TTL propagation prevents the MPLS network from being exposed (by traceroute ). IP internal reachability information Mpls traffic-eng router-id loopback0 mpls traffic-eng area 0 Router isis Record Route: NONE Experiment 1 Label State Outgoing 1 The above figure encapsulates a three-layer label package. For an LSR , only the first label is processed. Each layer of the label has a bottom of the BoS stack to indicate whether it is already the bottom of the stack of the label, and the last label has BoS=1 . Ip unnumbered Loopback0 tunnel mode mpls traffic-eng tunnel destination 5.5.5.5 Tag header TTL and IP header TTL is the same, is usually copied from IP header TTL value (when an IP packet enters the MPLS network), which is TTL propatation ! Ip unnumbered Loopback0 tunnel mode mpls traffic-eng tunnel destination 5.5.5.5 OutLabel : Ethernet0/0, 204 RSVP Signalling Info: Type escape sequence to abort. Tracing the route to 5.5.5.5 / / Whether the local will retain all the label mapping messages received from the neighbor in the database 3.3.3.0 [115/20] via 10.1.23.3, Serial1/0 Comment Discovery Sources: MPLS TE router ID: 1.1.1.1 This can be area at any level within the router adjacency relationship; may be other area adjacent L2 or L1 / L2 router forming L2 Tunnel mpls traffic-eng bandwidth 50000 tunnel mpls traffic-eng autoroute announce 10.1.34. 4 4.4.4.4 The label is incorrect. This situation only occurs when the IGP is OSPF . Because if the loopback is used as the router-id of the ldp and it is not 32 -bit, OSPF will automatically issue the 32 -bit loopback address. Causes the label to be assigned an error. TE metric: 1 For details on the untagged , aggregation, etc., and the causes, see "PASSHOT MPLS VPN Technical Documentation" We complete the experiment as long as the R2 and R4 configuration domain-password can, Rl is a zero-configuration ( Domain Authentication actually level2 LSP embedded for authentication TLV ). LDP ID election is the same as OSPF routerID Comprising one or more routers is configured on the source IP address, the CISCO IOS in Ordered control mode : Odered Control The target network segment involved in MPLS is the same as traditional IP forwarding. Router(config)#mpls traffic-eng reoptimize timers frequency ? *Aug 18 09:06:07.919: version:1 flags:0000 cksum:0000 ttl:255 reserved:0 length:232 RFC1195 Fast tag rewrite with Fa0/0, 10.1.34.3, tags commit: {303} via 10.1.15.5, 0 dependencies, recursive PSNP Network 2.2.2.2 0.0.0.0 area 0 See if you receive HELLO from the other party Exist in the message The boundary of the area is on the link R2-PE1#show mpls forwarding-table detail DBD Tspec: ave rate=0 kbits, burst=1000 bytes, peak rate=0 kbits RSVP Resv Info: L2 router , connected to different Leve1 area . Stores a separate Level2 LSDB . Tunnel mpls traffic-eng path-option 10 dynamic !! configured for the device net address, a plurality of, up default . 3 th The concept of "similar" in IP R2#show ip route 104 ! Configure the tunnel to use a statically specified path or a dynamic path calculated through the TE topology database. IS-IS metric 55.55.55.55 [110/2] via 0.0.0.0, 00:00:01, Tunnel0 InLabel : - OutLabel : FastEthernet1/0, implicit-null RSVP Signalling Info: *Aug 18 09:06:02.699: HOP type 1 length 12: Mpls traffic-eng tunnels mpls ip 10.1.45.5 5.5.5.5 Type 1 length 8 : LSRs maintain only one LDPsession for each label space Removal Trigger: re-route path verification failed Tunnel mpls traffic-eng path-option 10 dynamic The maximum bandwidth is the total bandwidth of the link. In CISCO IOS , this value matches the physical link or the configured bandwidth value. 75000 Label Active Path Option Parameters: *Aug 18 04:37:06.239: version:1 flags:0000 cksum:DEB3 ttl:255 reserved:0 length:132 *Aug 18 11:31:44.598: IS Hops:1 10.1.23.2 There is a difference between the two The configuration of R1 is as follows: Network 2.2.2.2 0.0.0.0 area 0 724 State: Oper; Msgs sent/rcvd: 26/22; Downstream Up time: 00:09:33 202 Ability to send detail link information , including bandwidth . Replaces IS Neighbor TLV TLV 22 can contain 7 sub- TLVs , three of which contain bandwidth information for TE Now, shut down the e0/1 port of R2 . Detailed LSP header 75000 Net 49.0001.0000.0000.0001.00 There are two ways to set the path of the TE tunnel ( Explicit explicit or Dynamic dynamic) Router-id 5.5.5.5 0xA538 104 *Aug 18 09:06:07.919: Network 10.1.23.2 0.0.0.0 area 0 1103 The default MaxAge is 1200 seconds and ZeroAgeLifetime is 60 seconds. When the serial number of the LSP sent by an IS reaches R1#show ip ospf database Fa0/0 40s , and in order to establish an adjacency relationship, the holding time of both parties must be consistent. The above command will directly change the cost of the above calculated route to y. The bandwidth information that MPLS TE needs to advertise is: Of course,ccna prep questions, when deploying, we strongly recommend that the same tunnel should have the same priority and priority. The affinity attribute is a property that describes the MPLS TE tunnel and is also composed of 32 bits , which is exactly the same as the number of attribute-flags mentioned above . Also configured with the affinity attribute is a mask, also 32bits , which is used to match the attribute tag and the affinity attribute.