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!! Note that running MPLS , IP cef must be turned on
Ip address 10.1.12.2 255.255.255.0
Looking at the above topology, we need to establish a TE tunnel between R1 and R5 . Under normal network conditions, we want the tunnel path to be R1-R2-R5 , which is an explicit specified path. In order to make the tunnel path have a backup, we can define a path-option , this path uses the dynamic setting method,ccna resources, let CSPF calculate it by itself, then the configuration is as above.
A targeted LDP neighbor relationship has been established with R4 .
10.1.34.4 [MPLS: Label 403 Exp 0] 0 msec 0 msec 4 msec
Tag or VC
SRM is cleared after receiving a PSNP acknowledgement on this LSP
Tunnel mpls traffic-eng priority 6 6
LDP discovery sources:
When R1 recalculates the shortest path, it does not consider passing the R2 out area. Then there is only a default route to R3 on R1 . Of course, the route directly connected to R2 can still be seen on R1 .
L1 router re-releases external routes into IS-IS
Each tag mapping message contains two elements : FEC TLV and Label TLV
Which table is specifically checked depends mainly on the Layer 2 encapsulation of the received data. For example, if the Layer 2 encapsulation is Ethernet (data frame), look at the value of the Type / Length field of the frame header :
The initial environment is as shown above, and the traffic from R1 to R8 has been carried on the green path shown in the figure.
Record Route: 22.214.171.124(200) 126.96.36.199(403)
Attribute Flags: 0x00000000
For a router that supports IPv6 , the algorithm for performing load balancing on MPLS packets is as follows:
Ip rsvp bandwidth
RFC2966 standardized from Level2 to Level1 leaked routes
Mpls traffic-eng signalling interpret explicit-null verbatim
*Aug 18 04:37:06.239: Minimum Path Bandwidth (bytes/sec): 1250000
Ip address 188.8.131.52 255.255.255.0 ip router isis
Network 184.108.40.206 0.0.0.0 area 0
Link State ID: 220.127.116.11 Advertising Router: 18.104.22.168 LS Seq Number: 8000001F Checksum: 0x580A Length: 60
Route-map test permit 10 router isis
But if the router performing load balancing is a P router, what does it receive is a label package with multiple labels? We know that no matter how many tags you have, the tag stack is followed by the IP header, and the first field of the IP packet is version , if
Version = 0 length in words = 7 service id = 5, service length = 6
TE tunnels are an aggregation of traffic flows of the same class (bandwidth , etc.) which are placed inside a common MPLS LSP
Mpls traffic-eng tunnels ip rsvp bandwidth
O 10.1.34.0 [110/3] via 10.1.12.2, 00:00:39, FastEthernet0/0
Domain-wide Prefix Distribution with Two-Level IS-IS
Type-10 Opaque Link Area Link States (Area 0)
Targeted Hello 22.214.171.124 -> 126.96.36.199, active, passive
Remote binding: tsr: 188.8.131.52:0, tag: 200 tib entry: 184.108.40.206/32, rev 4
MOSPF extension provides support for IP multicast routing
The configuration of R2 is as follows:
Each priority corresponds to an available bandwidth
Also called a pseudonode, it is a virtual router in a broadcast multi-access network, created by DIS.
IPv6 , then it must publish routing information with this NLPID value.
AutoRoute basic configuration
The above label, there is another way to see, is to look at the TE Tunnel directly on R2 :
This global command is used to modify it. After the expiration of the timer, the IGP will establish an adjacency on the link. Once the IGP adjacency is established and the LDP session has not been synchronized, the IGP will advertise the metric of the link to the maximum.
Designated IS and PseudoNode
Redistribute isis ip level-2 into level-1 route-map test
After the basic configuration is completed, since R2 and R3 are L1\L2 routers , for both of them, they will advertise themselves to the local level1 area as a way to go out , by setting ATT in the LSP generated by themselves . we R1 point of view isis database has been able to see out. R1#show isis database
Mpls traffic-eng router-id loopback0 mpls traffic-eng area 0
*Aug 18 04:37:06.243: Tun Dest: 220.127.116.11 Tun ID: 0 Ext Tun ID: 18.104.22.168
Ip router isis
Data link layer address
Label space : Label Space
MPLS does not assign labels to BGP routes, but assigns labels to the next hop of BGP routes.
Network 10.1.12.1 0.0.0.0 area 0
Mpls ldp router-id loopback0
Extended IP reachability reachability TLV (type 135 )
When the change attribute (path bandwidth), using Make Before Break manner
In the LAN , SNPA refers to the MAC address.
*Aug 18 09:06:02.699: version=0, length in words=7
Explicit empty label
Ip address 22.214.171.124 255.255.255.255
In IOS , the normal router hello interval defaults to 10S , and the DIS defaults to 3.3S .
Record Route: NONE
IS-IS link type
*Aug 18 11:26:02.546: SESSION
Reservable BW (kbps)
For all practical applications, IS-IS only supports broadcast and point-to-point links. The NBMA link is not supported . In the NBMA environment, it can be equipped
RSVP and label
Link ID:: 0 !! R2 has two direct links to participate in MPLS TE . This is the first, which is F0/0 .
The flooding of LSPs means that when a router reports its own LSPs to neighboring routers , the neighboring routers transmit the same LSPs to its neighboring routers, and then LSPs are transmitted to the entire hierarchy. One way inside. Through this "flooding", each router in the entire hierarchy can have the same LSP information and keep the LSDB synchronized. Each LSP has its own 4- byte serial number. The sequence number of the first LSP sent by the router is 1. When the new LSP needs to be generated , the sequence number of the new LSP is incremented by 1 on the previous LSP sequence number . A higher serial number means an updated LSP .