cisco certification exam

cisco certification exam

High-priority tunnels can preempt resources of low-priority tunnels. Support 0-7 total 8 tunnel priority levels *Aug 18 04:37:06.239: SENDER_TSPEC type 2 length 36: *Aug 18 09:06:02.699: Tun Dest: 5.5.5.5 Tun ID: 0 Ext Tun ID: 1.1.1.1 PATH R2#show ip ospf database router self-originate Ip router isis encapsulation frame-relay isis priority 100 Next-address 10.1.23.3 Tunnel mpls traffic-eng path-option 10 dynamic Each hop LSR that the TE tunnel needs to traverse is added to an ERO . This is an ordered list of interface IP addresses, each LSR Attached-bit Mpls traffic-eng tunnels mpls label range 400 499 Mainly contains TE tunnel bandwidth request It is. At this moment: Configured Areas: 1 DIS send HELLO interval ordinary packet router of 1/3 (default 3.3s ) Network 10.1.34.4 0.0.0.0 area 0 This will cause R2 to calculate the route, from the tunnel0 port to the 5 and 55 route metric becomes 32+1=33 , which is greater than the metric=31 of the route taken from e0/1 . So the routing table of R2 has changed, and the routes of the 5 and 55 network segments have become: Router ospf 1 Three triggers that may cause the TE tunnel to reoptimize . *Aug 18 09:06:07.919: IS Hops:1 (Tunnel0) Destination: 4.4.4.4 We see a lower priority than 5 of the Tunnel , along with the available bandwidth into a 75-20 = 55M . Feature overview Interface eth 0/0 Source-based routing can be used here. This LSP is called an MPLS TE tunnel. It is one-way. And the configuration of the tunnel only needs to be performed on the headend LSR . O OSPF supports the following network types: P2P , broadcast, NBMA , point-to-multipoint, and on-demand circuits Fa0/0 Interface Serial0/2 Mpls label rangempls label range 200 299 Mpls traffic-eng tunnels ip rsvp bandwidth End host. For example , the ISO CLNP workstation searched by the ES-IS protocol . *Aug 18 04:37:06.239: version=0, length in words=7 LSP Seq Num Mpls traffic-eng tunnels ip rsvp bandwidth *Aug 18 11:26:02.546: Metric: 0 75000 104 Mpls traffic-eng tunnels mpls label range 500 599 Network 10.1.45.4 0.0.0.0 area 0 Experimental configuration Mpls traffic-eng router-id loopback0 mpls traffic-eng area 0 Redistribute ospf 1 vrf VPN-A match internal external 1 external 2 *Aug 18 09:06:07.919: Tun Dest: 5.5.5.5 Tun ID: 0 Ext Tun ID: 1.1.1.1 R1#show mpls ldp neighbor Fspec: ave rate=0 kbits, burst=1000 bytes, peak rate=0 kbits History: Network 2.2.2.2 0.0.0.0 area 0 If a router does not refresh its generated LSP after the LSP refresh interval , and the LSP remaining timer field has been reduced to 0 , all routers that have the LSP copy will copy the LSP from its own chain after the 60S grace period. Clear in the road state database. This 60S time is ZeroAgeLifetime , zero lifetime, and not configurable. Activate record route , which can make the PATH and RESV messages carry the record route object, record the IP passing along the tunnel , and can play a certain anti-ring effect. Of course, there are other important functions, which will be explained later. Transport addr is generally equal to LDP ID unless it is specified by hand ( mpls ldp discovery transport-address ) . Note that here (described above) there are actually three kinds of addresses: interface IP , Transport addr , LDP ID AFI+IDI is used to identify the Domain L1/L2 router re-releases external routes into IS-IS ( to level1 ) Switched Route metric is 168, traffic share count is 1 Bandwidth: 2000 Protocols support Link Sharing Detail: Router ospf 1 vrf VPN-A redistribute bgp 2345 subnets network 10.1.56.5 0.0.0.0 area 0 Interface eth0/0 Attribute Flags: 0x00000000 IP subnet Once LDP is activated, the LSR generates a label locally for the prefix in the routing table,cisco certification exam, and then bundles it with the prefix to send the label mapping message to all LDP neighbors. When I receive the remote binding from the LDP neighbor , I bundle the tags and the local bindings that are localized for the specific prefix into the LIB . Ip unnumbered Loopback0 tunnel destination 5.5.5.5 tunnel mode mpls traffic-eng Mpls traffic-eng tunnels ip rsvp bandwidth Ip address 3.3.3.3 255.255.255.0 ip router isis System ID LDP discovery sources: Local tag RSVP Path Info: MPLS VPN configuration RESV For example, in the above example, tunnel0 is established in R3 to R7 . For R1 and R2 , they do not know the existence of the tunnel . When they go to 7.7.7.7/32 , only the IGP 's own routing is performed. Calculation, then R2 is likely to take the path of R4-R6-R7 , but we may prefer that these traffic can be transmitted through the tunnel , then for this requirement, autoroute can not be achieved, need to use Forwarding ajacency .