ccnp practice

ccnp practice

Extended intermediate system reachability TLV (type 22 ) Tun Sender: 1.1.1.1 LSP ID: 521 R2.02 Interface fast 1/0 *Aug 18 04:37:06.239: Incoming PathError: !!R2 sends a patherror message to R1 Router(config)#Ip cef Or Tunnel Id !! Don't forget the mapping of CLNS 10.1.23.3 MPLS TE takes into account the actual use of network resources, so it requires more information than just interface bandwidth or cost . 10.1.12.2 [MPLS: Label 203 Exp 0] 200 msec 84 msec 136 msec Such as 39.0f01.0002. 0000.0c00.1111 . 00 The PATH message carries a label request object, which is hopped and hopped from the tunnel first-end router to the tail router. In the cfg-ip-expl-path mode, you can also use the list keyword to view all the next-addresses that have been entered . Use index x next-address to specify the index number of each next- hop IP that has been entered . Device Internet segment 10.1.xy.0 / 24 , where xy is the device number, X small y large In general, any router that checks for a corrupted LSP will be corrupted by sending a remaining lifetime to 0 . ! Router(config)# mpls ldp session protection for acl-peer duration sencondes We see that R1 these inter-area routes are still there, but R1 no longer refers to the default route to R2 . Record Route: 10.1.34.3 10.1.13.1 0x80000018 0x001C01 1 R2#show mpls traffic-eng tunnels Bytes tag switched SRM : used to control the delivery of LSPs to adjacent routers during the update process. Ip cef Type : 0x0800 carries IPv4 packets and finds FIB. *Aug 18 09:06:02.699: ADSPEC type 2 length 48: Protect lsp path: 10.1.12.1 10.1.12.2 The IS-IS packets have the same common 8B above , and the additional header fields are different, and then the TLV field. At the time of packet capture , the ternary in the TLV : type, length, variable length content, type and length in the packet, the packet capture software may not be presented, but the type and length can be found from the binary code of the packet capture result. content. Address-family ipv4 vrf VPN-A no synchronization 3B 's default metric , enough for you to stink? Router isis Nolabel/505 1.1.1.1:0 Next-address 10.1.45.5 Mpls traffic-eng tunnels ip rsvp bandwidth For IP applications , 1 byte defines AFI in the NSAP address , at least 2 bytes defines the actual area information, 6 bytes defines the system ID and The overload feature is, after all, a product of an era in which device performance is not strong enough. However , the extended application of overload is very worthy of attention. Let's take a look at the following picture: Contains information such as the tunnel destination address, tunnel ID , and extended tunnel ID (that is, the tunnel start point) Peer LDP Ident: 4.4.4.4:0; Local LDP Ident 2.2.2.2:0 TCP connection: 4.4.4.4.24940 - 2.2.2.2.646 128 33M OSPF 10.1.56.5 [MPLS: Label 505 Exp 0] 8 msec 0 msec 0 msec Impact of route summarization on MPLS lab environment OSP PDU *Aug 18 09:06:07.919: Token bucket fragment (service_id=1, length=6 words Basic noun The configuration of R1 is as follows: MPLS TE router ID: 1.1.1.1 An LDP session is a TCP session, and a TCP session may be attacked by TCP fragment spoofing. LDP authentication can be used for protection. MD5 will add a signature — called the MD5 digest, to the TCP segment. ISO10589 Mpls ldp session protection for 1 duration 30 The PoP : receives downstream air sent by the tag assigned to a specific prefix, the value of this tag is 3 , then the LSR to the downstream LSR transmits the prefix data destined time, he will put up top label ( the POP ) for Forward, note that this time only need to check for this LSR ! Area 2 -byte area identifier, also referred to as Domain from the upper portion (the portion defined HODSP is ) used to Domain ! *Aug 18 04:37:06.239: version=0, length in words=7 Redistribute connected level-1 10 Router(config)# mpls ldp targeted-hello holdtime x interval y 42000 Control plane : exchanges Layer 3 routing information (such as OSPF , ISIS , BGP, etc.) and labels (such as TDP , LDP , BGP, and RSVP ). Ip explicit-path name R2R4R5 enable next-address 10.1.12.2 Does it match, verify that the password is correct, the area ID or something. Router(config)# mpls ldp discovery holdtime seconds Ip address 10.1.123.3 255.255.255.0 BGP route delivery in MPLS environment For details on the untagged , aggregation, etc., and the causes, see "PASSHOT MPLS VPN Technical Documentation" ! Support for diagnosis of LSP tunnel Or Tunnel Id The IGP will advertise the link with normal IGP metrics. At this time, the traffic that traverses this interface is the traffic for label switching. Basically,ccnp practice, if the LDP session is not established, OSPF will not establish adjacencies on this link, and HELLO will not be sent at all (of course, there is a basic word here, that is, there are two cases) . Default change threshold (bandwidth occupancy): Environmental description Min unit=0 bytes, max pkt size=2147483647 bytes Interface eth0/0 Based (internet per-Platform ) compared to the label space-based interface ( per-interface ) security label space to lower 10.1.23.2 Now create a tunnel on R1 : 0x00000011 Metric: 10 On C , first look up the LFIB table and find that the label is to be popped up, so it will pop up the label and pop up and find it is an IP packet, so go check FIB again. Local binding: tag: 101 Network 10.1.45.4 0.0.0.0 area 0 mpls traffic-eng router-id loopback0 mpls traffic-eng area 0 55.55.55.55 [110/2] via 0.0.0.0, 00:00:01, Tunnel0 System ID , larger than Test the transmission process of the data stream, observe the phenomenon AutoRoute: disabled LockDown: disabled Loadshare: 0 bw-based auto-bw: disabled Next, R2 receives the tag packet. R2 knows that this is a tag packet from the type field of the Layer 2 Ethernet frame header of this packet, so it looks for its own LFIB table: *Aug 18 09:06:02.699: parameter id=127, flags=0, parameter length=5 IS-IS adjacency and network type Interface Loopback0 One is a Point-to-Point IS to IS hello PDU . Note that this time R2 generated LSP already set overload-bit up , the R1 on the show isis database to see Locally assigned labels are distributed to neighbors, and if there are multiple connections to a single neighbor, the label is valid on all connections. Then regardless of local 201 Physical Bandwidth: 100000 kbits/sec Res. Global BW: 75000 kbits/sec Res. Sub BW: 0 kbits/sec Downstream:: Tunnel mpls traffic-eng forwarding-adjacency We see that there are two layers of labels here. Therefore, R2 pushes the original IP packet into a layer of VPN label 505 and pushes in two layers of labels 305 403 . It is noted here that the label 403 is the LDP label assigned by R4 with the prefix 5.5.5.5/32 , which is passed to R2 through the targeted LDP connection . And 305 is the label that R3 assigns to the TE tunnel through RSVP . 0/0/0 The loopback0 address space of all devices is xxxx/32 , and x is the device number. 3.3.3.0 [115/20] via 10.1.34.3, Serial0/0 Comparison of terms between IS-IS and OSPF : IS-IS only supports reliable diffusion on point-to-point links, and the spread on the broadcast link is unreliable. However, periodic broadcasts through DIS After completing the above configuration, we find that the is-is neighbor relationships of R2 , R3, and R3 and R4 are UP . This is because the IIH package does not carry TLV information for verification . In addition, the routing table of R3 is empty. Error Node: 10.1.12.2 Error Code: 25 (Notify) 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 , CEF must be enabled on the router when MPLS is enabled . Produce PoP and untag case R5 configuration is as follows Ordered control mode : Odered Control 4 10.1.45.5 0 msec Modify the ldp hello message sending interval, the default 5S Mpls traffic-eng tunnels ip rsvp bandwidth About LDP and IGP synchronization The configuration of R2-PE1 is as follows: Length R1(config)#interface fa0/0 Interface Address : 10.1.12.1 Admin Metric : 1 Network 5.5.5.5 0.0.0.0 area 1 *Aug 18 09:06:07.919: Minimum Path Bandwidth (bytes/sec): 2147483647 There are two types of tunnel priorities: FastEthernet0/0, Src IP addr: 10.1.12.2 Addresses bound to peer LDP Ident: *Mar 1 00:09:39.243: ISIS-Adj: Rec L1 IIH from cc01.0a44.0000 (FastEthernet0/0), cir type L1, cir id 0000.0000.0002.02, length 1497 Mpls traffic-eng tunnels ip rsvp bandwidth New object for RSVP-TE extension General Parameters break bit=0 service length=8 IGP Neighbor: ID 10.1.23.2 Fa0/0 In the cfg-ip-expl-path mode, you can also use the list keyword to view all the next-addresses that have been entered . Use index x next-address to specify the index number of each next- hop IP that has been entered . Ip address 10.1.123.2 255.255.255.0 Basic experiment Configuration example 1 : 10.1.12.2 Mpls traffic-eng tunnels ip rsvp bandwidth Ip cef IGP metric: 1 132 OO Tun Sender: 1.1.1.1 LSP ID: 521 Used to publish link state information is somewhat similar to OSPF of LSA stuff Tag rewrite with Fa0/0, 10.1.34.3, tags imposed: {303} Tspec: ave rate=2000 kbits, burst=1000 bytes, peak rate=2000 kbits The route is normal, and all three routers can learn the route of the whole network. and so: TE tunnels are distinct from MPLS LSP through which it traverses: Config Parameters: Ip unnumbered Loopback0 Network 10.1.34.4 0.0.0.0 area 0 Then the Leve1 adjacency is formed between the ABs , because at the moment it belongs to the same area. A continued maintenance and region 49.0001 of Level1 abutment, B can continue to maintain a region 49.0002 of Level1 abutment, since the AB formed between the new Level1 abutment device initially began to call their mutually isolated Level1 database, and diffused to the respective Level1 Neighbors, thus achieving the merger of the regions.