ccna routing and switching online test

ccna routing and switching online test

HELLO holdtime is the maximum allowable interval for an IS-IS router to receive 2 consecutive hello packets. Hello holdtime=hello interval × hello multiplier . Therefore hello holdtime defaults to 30S . If a router has not received any hello after the hello holdtime expires , the neighbor is declared invalid. CEF 's hash algorithm to select the battle interface. Note that if there is an IP (unlabeled) path and a labeled path has the same metric, only the labeled path is used for packet forwarding. This is because in some cases, traffic that passes through an unlabeled path cannot reach its destination. For example , on a P router in an MPLS VPN environment . Down Thresholds: 100 99 98 97 96 95 90 85 80 75 60 45 30 15 R2(config-if)#mpls traffic-eng administrative-weight 100 Bandwidth change R1(config-keychain)#key 1 *Mar 1 00:00:32.759: ISIS-Upd: full SPF required A puts the data on the label 23 , goes to B , and ejects the label header to C ( PHP mechanism); C receives the IP packet to find the FIB table, and then presses the package 55 to D , D finally finds LFIB and Pop the label to drop the IP packet to E , and E forward the IP packet to the destination. Route-map test permit 10 router isis By default, the OSPF hold time ( dead-interval ) is The configuration of R2 is similar, so that in the TLV used for authentication in the IIH , the ciphertext after the hash is loaded, and the password is not exposed. Router ospf 1 Ip address 4.4.4.4 255.255.255.255 Network 5.5.5.5 0.0.0.0 area 0 ! Record Route ( RRO ) Or Tunnel Id 2.2.2.2 [110/65536] via 10.1.12.2, 00:00:47, FastEthernet0/0 No longer take the tunnel , and then go to traceroute 55.55.55.55 from R2 , no longer see the label. OutLabel : Ethernet0/0, 200 RSVP Signalling Info: description 204 Mpls traffic-eng tunnels mpls label range 200 299 15 Tunnel mpls traffic-eng autoroute metric relative parsing if the configuration of R2 changes as follows: Election DIS . In this network,ccna routing and switching online test, the DIS will generate and flood the new pseudo-node LSP on each of the routing layers it participates in (whether L1 or L2 ) and on each LAN it is connected to . Each router on the LAN establishes adjacency with all other routers and DISs , and does not elect to back up the DIS router. The elected DIS does not guarantee that it will always be DIS . Local tag: 104 Note: IS-IS 's Backbone is not what a particular area *Aug 18 04:37:06.239: SESSION type 7 length 16: = 250000 bytes/sec Intermediate LSRs - Intermediate LSRs receive an incoming labeled packet, perform an operation on it, switch the packet, and send the packet on the correct data link. Interface Tunnel0 Do not need to explain it again? At R4 , R4 pops the top label and forwards the packet to R5. *Aug 18 09:06:02.699: version=0, length in words=7 Router-id 1.1.1.1 AutoRoute: enabled auto-bw: disabled Test . 6 : SET-overload-External 'bit the suppress interlevel R1#show mpls ldp neighbor Filter the inbound label bundles advertised by LDP neighbors. The configuration of ip rsvp bandwidth R3 is as follows: 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 R3#show ip cef exact-route 10.1.35.5 1.1.1.1 1.1.1.1:0 Dynamic Hostname Exchange Mechanism for IS-IS PSNP *Mar 1 00:00:32.759: ISIS-Upd: Important fields changed Mpls traffic-eng tunnels mpls label range 400 499 For a router that supports IPv6 , the algorithm for performing load balancing on MPLS packets is as follows: Tunnel mpls traffic-eng autoroute announce Interface eth 0/0 The interface is assigned a new metric value; Add: The top label is replaced (exchanged) by a new label, and one or more labels are added to the upper layer of the replaced label. Mpls ip Interface fa0/0 Certification Information Ip address 10.1.123.2 255.255.255.0 Next Hop By default, the IS-IS area is the stub area, which is the latest release. Since the IP packet destined for 6.6.6.6 is sent to R2 , the IP packet is pushed into the VPN label 505 under the inner layer , which is no problem. Then we continue, the VPNv4 route on 6.6.6.6 on R2 is passed by 5.5.5.5, which is R5 . 3.3.3.0/24 Link state information IGP itself supports 203 3.3.3.3/32 Interface eth 0/1 Note: a IS-IS routing domain ( routing Domain ) does not necessarily need to have two levels, if only a region of deployment, it may be all L1 or all L2 of , recommended L2 of , to obtain a good scalability. The average allocated traffic on the interface. For the HDLC (Advanced Data Link Control) interface, SNPA is set to " HDLC " Mpls traffic-eng tunnels mpls label range 300 399 Alternatively, you can configure the following command on the tail router: Activate the MPLS TE extension for each router's OSPF and manually set the RouterID for MPLS TE . Fa0/0 55.55.55.55 [110/31] via 10.1.23.3, 00:03:44, Ethernet0/1 Current LSP: Routing domain *Aug 18 11:26:02.546: Appears only in the LSP of the L1 router . List the adjacent L1-router and the end *Aug 18 09:06:02.699: Hop Addr: 10.1.12.1 LIH: 0x20000403 The labels constituting the LFIB may not be distributed by LDP , and the RSVP allocation label is used in the MPLS traffic engineering . In the MPLS VPN , Pop tag UP Network 10.1.12.2 0.0.0.0 area 0 Signalling: connected OSPF supports the following network types: P2P , broadcast, NBMA , point-to-multipoint, and on-demand circuits Interface Tunnel0 75000 Router(config)#tunnel mpls traffic-eng path-selection metric igp *Aug 18 09:06:07.919: Setup Prio: 7, Holding Prio: 7 Router(config)#tunnel mpls traffic-eng path-selection metric ? igp use IGP metric In general, a IS-IS process, only one NET , you can of course also a IS-IS assign multiple processes areaID different NET address, pay attention to these NET addresses SystemID must be the same. This way the router can connect to multiple zones, which is great when we need to merge different zones into one zone. Generally, a Level1 router participates in the flooding of L1 LSPs only in the area to which it is connected . If this router is connected to multiple areas, flooding of L1 LSPs in multiple areas can be achieved , thus completing effective area consolidation. .