cisco ccna learn

cisco ccna learn

Ip unnumbered Loopback0 In operational contexts , a tunnel can be removed from one path and palced onto another. After the increase of this order, relying on the autoroute characteristics calculated, associated tunnel0 mouth of these two OSPF routing metric becomes 9 + 1 : Here 9 is our configuration autoroute metric 9 , where 1 is R5 is Loopback port cost . Note that this only affects R2's own routing . Partition repair *Aug 18 09:06:02.699: Path MTU: 1500 LSP Tunnel R1_t0 is signalled, connection is up 959 1.1.1.1 Interface eth 0/2 R1(config)#ip route 4.4.4.4 255.255.255.255 tunnel 0 R1#show ip route IP Address: Metric: 10 Select the path with the lowest IGP cost RESV Router ospf 1 Designated IS ( DIS ) DIS no backup DIS , DIS can be preempted, DIS to 3 transmission times frequency Hello PDU Min unit = 0 bytes,max pkt size = 1500 bytes Activate the MPLS TE extension for each router's OSPF and manually set the RouterID for MPLS TE . ( NLPID 0x81 ) and IP ( 0xCC ) Interface Loopback0 ! ! *Aug 18 11:26:02.546: Mpls traffic-eng router-id loopback 0 mpls traffic-eng level-1 Ip explicit R1toR5 Then R1 and R3 receive a label mapping with a prefix of 2.2.2.0/24 and a label of 3 . At the same time, they also received the R2 updated route. Since the loopback interface route is updated by OSPF by default, it is updated in /32 mode. Therefore , the route learned on R1 and R3 about 2.2.2.2 is /32 bit. of. Then this is a problem, my routing entry is 2.2.2.2/32 , but the label message you sent me is 2.2.2.0/24 , it doesn't match, so R1 thinks that the label is going to Not 2.2.2.2 , just give an untagged , just like the LFIB table we saw for R1 . In this way, when R1 receives the label package and goes to 2.2.2.2 ,R1 will pop up the label stack of the label package, then find its own FIB table and forward the message out. This seems to be no problem in this topology, but in many environments, there will be problems, such as MPLS VPN . So how to solve it? Very good, R2 loopback port to an ip ospf network point-2-point ,cisco ccna learn, or change the mask.