ccna london

ccna london

SESSION Mpls traffic-eng tunnels mpls label range 400 499 Router-id 5.5.5.5 The link type indicates whether the link is a point-to-point or multiple access link. R2#sh isis neighbors R3.02-00 Mpls traffic-eng tunnels mpls label range 200 299 Discovery Sources: Ip address 3.3.3.3 255.255.255.255 i L2 1.1.1.0 [115/30] via 10.1.34.3, Serial0/1 Name: R1_t0 Status: Partition repair: on . 8 bits if the LSP originating router supports the repair area division is set this field Attached bits : the first 4-7 bits, for setting the LSP association with another area available with the following metrics: of . 4 -bit - default; 5th bit - delay; 6th bit - overhead; 7th bit - error Ip router isis encapsulation frame-relay isis priority 100 !! The outbound label is 301 Link type supported by IS-IS Mpls traffic-eng router-id loopback0 mpls traffic-eng area 0 !! Path error message sent by R2 to R1 Fa0/0 0/0/0 Protocol overview R3 configuration is as follows (Note that, Area0 and area1 must activate the MPLS the TE ): About CLNP RSVP Fa0/0 Fa0/0 Label 0 explicit null label Interface fast 0/0 1.0.0.0/24 is subnetted, 1 subnets 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. Record Route: 10.1.34.3 10.1.13.1 947 Tunnel mpls traffic-eng priority 7 7 tunnel mpls traffic-eng bandwidth 20000 Router-id 4.4.4.4 MPLS LDP-IGP synchronization example Commonalities: Priority 7 : 9375000 (Link ID) Network/subnet number: 2.2.2.2 (Link Data) Network Mask: 255.255.255.255 Number of TOS metrics: 0 HELLO PDU (ESH , ISH and IIH) RFC 3277 Net 49.0001.0000.0000.0002.00 Ip cef Default route injection Links that do not meet the required bandwidth are not considered. Then after filtering, the following links are left: Last update from 10.1.123.2 on FastEthernet0/0, 00:01:32 ago Routing Descriptor Blocks: ! SNPA ( Subnetwork point of attachment ) 75000 *Aug 18 09:06:07.919: Error Code: 24 (Routing Problem) Bytes tag switched No frame-relay inverse-arp C It is also to check the FIB table, find 301 corresponding to the tag outgoing label is PoP and the next hop is D , then the head will pop up labels, which expose the original IPv4 data, C will be to the packet D . ! Metric: 0 Hello Record Route: NONE Retention mode : Label Retention R2-PE1#show ip route Ip address 10.1.23.3 255.255.255.0 Setting the priority indicates how important a tunnel is so that it can preempt other tunnels ; The LSP is set by ATT . Take R2 as an example. If the S1/0 port of R2 is DOWN , it loses the connection of Backbone , so R2 Record Route: NONE O 3.3.3.3 [110/3] via 10.1.12.2 , 00:00:37, FastEthernet0/0 0x18B7 In the above figure, we define attribute tags for the two interfaces of R1 . The attribute tag attribute-flags is a 32-bit field. DIS no backup DIS , DIS can be preempted, DIS to 3 transmission times frequency Hello PDU Interface eth 0/1 Priority 5 : 9375000 MPLS TE path optimization Router ospf 1 3.0.0.0/32 is subnetted, 1 subnets L1 O Traffic using traffic engineering uses source-based routing instead of routing based on destination IP address New object for RSVP-TE extension Router isis In IPv4 , the empty tag is 0 , and the ipv6 is 2 . Set-overload-bit R5 is also similar: TE metric: 1 Can form adjacencies with other L2 (or L1/L2 ) routers ! LSP Seq Num LSP Checksum LSP Holdtime DIS Network 10.1.34.4 0.0.0.0 area 0 *Aug 18 09:06:07.919: Ip cef 75000 i L2 !! OSPF cost of the interface Show clns neighbors 0 kbits/sec Support tag distribution in DoD ( Downstream-on-Demand ) mode R5.00-00 R3.02-00 75000 Mpls traffic-eng tunnels mpls label range 400 499 That is the CEF table *Aug 18 09:06:02.699: 10.1.24.2 (Strict IPv4 Prefix, 8 bytes, /32) Record Route ( RRO ) DIS is preemptible, and there is no backup DIS , which means that when the DIS hangs, it is immediately reselected. LSP Head, Tunnel0, Admin: up, Oper: up Src 1.1.1.1, Dest 5.5.5.5, Instance 30 Fast Reroute Protection: None Maximum reservable bandwidth information: 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. Mainly two functions: 0x80000011 0x00F741 2 Remote binding: tsr: 2.2.2.2:0, tag: imp-null Headend frr information: Protected tunnel Support tag distribution in DoD ( Downstream-on-Demand ) mode Do not elect DIS , use CSNP to trigger database synchronization after the link is established . Mpls traffic-eng tunnels ip rsvp bandwidth Based on the platform ( of Per-Platform ) label space of just a LDPsession , even in the LDP there are multiple redundant links between neighbors ! Path maintenance 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 [Note] Label behavior of Frame Mode Mpls ldp router-id interface [force] TE Metric is equivalent to the concept of weight value, note that this is to be distinguished from IGP metric Path option 10, type dynamic (Basis for Setup, path weight 20) 201 Mpls traffic-eng router-id Loopback0 mpls traffic-eng area 0 Mpls traffic-eng router-id loopback0 mpls traffic-eng area 1 *Aug 18 09:06:07.919: 1.1.1.1 (Strict IPv4 Prefix, 8 bytes, /32) Targeted Hello 2.2.2.2 -> 4.4.4.4, active *Aug 18 11:31:44.598: Incoming PathError: Setting the priority and maintaining the priority all indicate whether a TE tunnel can preempt another TE tunnel by using the corresponding value . The lower the priority, the higher the importance. Only support IP Interface fast 1/0 Interface tunnel0 Ip ospf cost 1 Ip unnumbered Loopback0 tunnel mode mpls traffic-eng tunnel destination 5.5.5.5 Interface fast1/0 *Aug 18 09:06:07.919: parameter id=127, flags=0,ccna london, parameter length=5 Protocol overview Ip address 10.1.24.4 255.255.255.0 Pay attention to the distinction between autoroute and here . The autoroute feature is not activated in our configuration above . Autoroute feature and autoroute Interface eth 0/1 Network 10.1.45.5 0.0.0.0 area 0 Network 10.1.34.3 0.0.0.0 area 0 *Aug 18 09:06:07.919: Hop Addr: 10.1.12.1 LIH: 0x20000403 Mpls traffic-eng tunnels mpls label range 100 199 IS , since this is a LAN environment, DIS is elected , and each non- DIS router advertises its own adjacency with the DIS without notifying the adjacency with other physical ISs . The LSP of R3\R3 is similar, and will not be described here. Take a look at the LSP of this pseudonode : ! Or Tunnel Id Brief introduction to the work process Mpls ip Outgoing tag or VC Used to request complete LSP information when the database is synchronized on the broadcast link. Designated IS and PseudoNode Tag rewrite with Fa0/0, 10.1.12.2, tags imposed: {203} Router isis No longer take the tunnel , and then go to traceroute 55.55.55.55 from R2 , no longer see the label. 10.1.12.2 Environmental description In the above experiment, we announced the direct connection network of R1-R5 and R4-R6 in Core OSPF . However, we know that in actual situations, this chain outside AS is not declared in Core IGP . Road, so let's take a look at it. If you do not announce these two direct links in OSPF , what will happen : Since OSPF does not have these two directly connected segments, then 5.5.5.5 and 6.6.6.6 learn to come in. preferably not a need in R1 of the R4 to use Next-Hop-Self , R4 to R1 is also the same reason.