ccna exploration

ccna exploration

The above network is a typical Hub&Spoke network. Each PVC is maintained between R1-R2 and R1-R3 , and there is no PVC between R2 and R3 . Type 2 length 48: Ip route 5.5.5.5 255.255.255.255 Tunnel0 10.1.12.2 10.1.12.2 FastEthernet1/0, Src IP addr: 10.1.13.3 After the configuration is complete, the tunnel is up. Prefix Interface Tunnel0 Net 49.0001.0000.0000.0002.00 Wait for the message to view the adjacency. Next, the DIS election process begins . The router will check the received IIH and confirm the parameters. ATT/P/OL *Aug 18 04:37:06.243: version = 0 length in words = 7 Here there is a potential problem, because Level1 Router , do not know level2 routing (outside the region) information, instead of looking for the nearest L1 / L2 router to your destination, then it may appear sub-optimal path In order to solve this problem, IS-IS introduced a mechanism called route leakage. !! metric must be changed to wide of R3.02-00 Now, we have to build a TE tunnel from R1 to R6 with a bandwidth requirement of 30M . Note that the available bandwidth in the network at the moment is due to the above. Show isis spf-log First R2 routing table: 3.3.3.3 Frame-relay map ip 10.1.123.3 201 broadcast frame-relay map clns 201 broadcast The virtual link implements a level 1 repair path through the backbone . The zone designated router sets the partition repair of its level1 LSP . R6#traceroute 5.5.5.5 soure 6.6.6.6 Mpls traffic-eng tunnels mpls label range 400 499 Redistribute isis ip level-2 into level-1 route-map test There have been a lot of talks about ATT-bit before, so I won't be embarrassed here. I have tested on CISCO IOS Version 12.4(10) -- C3640-JK9O3S-M . On R1, which is L1 router , with default-information originate , I can't generate default route. MPLS configuration ( frame mode ) Mpls traffic-eng tunnels ip rsvp bandwidth Network 10.1.23.2 0.0.0.0 area 0 mpls traffic-eng router-id loopback0 mpls traffic-eng area 0 LSP link state data unit Clear domain authentication Mpls traffic-eng tunnels mpls ip MPLS TE of AutoRoute characteristics of the TE tunnel as a direct link participating SPF calculation (except R2 themselves) Reservable Bandwidth[3]: [0]: UP Then on R1 to see the tunnel , his TE metric becomes 102 . Interface Serial0/2 TE with Layer3 Labels 0-15 are all reserved labels. Here are some reserved tags that have a specific role: Interface Serial0/0 Physical Bandwidth: 100000 kbits/sec Res. Global BW: 75000 kbits/sec Res. Sub BW: 0 kbits/sec Downstream:: ! Mpls ip Local Router ospf 1 10.1.23.0/24 Network 10.1.34.3 0.0.0.0 area 0 Configuration change Network 10.1.12.1 0.0.0.0 area 0 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. LSP various types of TLV Route summarization on the L1/L2 router ( to level1 ) The L1 and L2 IIH PDUs on the LAN are sent to different multicast MAC addresses: L1 is 0180-C200-0014 and L2 is 0180-C200-0015 But if we modify the configuration on R1 : *Aug 18 11:31:44.598: Controlled Load Service break bit=0 service length=0 1/0/0 Can I perform route summarization on the L1 router ? 2.2.2.2 is directly connected, Loopback0 5.5.5.5 [110/31] via 5.5.5.5, 00:00:01, Tunnel0 10.1.12.0/24 is directly connected, Ethernet0/0 10.1.23.0/24 is directly connected, Ethernet0 /1 Impact of route summarization on MPLS Record Route: NONE End system adjacency routing Mpls traffic-eng tunnels ip rsvp bandwidth Then R1 will limit the establishment of targeted session of the peer , is 3.3.3.3 , which is R3 of LDP routerid , in addition, LDP session protection time is 30S ,ccna exploration, that is to say, 30S If the LDP neighbors yet up, targeted session will fail. Naturally, the protected tag information stored in the LIB is gone. Modify the bandwidth UP/DOWN threshold DIS send HELLO interval ordinary packet router of 1/3 (default 3.3s ), which ensures DIS when a failure occurs can be more quickly found. Comprising one or more routers is configured on the source IP address, the CISCO IOS in Set-overload-bit suppress interlevel redistribute connected level-1 Link state packet checksum Test the transmission process of the data stream, observe the phenomenon 0 kbits/sec 0x00000010 TLV Mpls traffic-eng tunnels ip rsvp bandwidth Explicit Route: 10.1.23.3 10.1.34.3 10.1.34.4 10.1.45.4 *Aug 18 09:06:07.919: 10.1.24.4 (Strict IPv4 Prefix, 8 bytes, /32) ISO10589 You can use the no mpls ldp igp sync command on a particular interface to turn off synchronization on the interface. The loop detection mechanism of LDP depends on the IGP protocol. LSP Targeted Hello 2.2.2.2 -> 4.4.4.4, active Network 10.1.12.1 0.0.0.0 area 0 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 Mpls traffic-eng tunnels mpls label range 400 499 Next Hop PDU 5 Tunnel mpls traffic-eng autoroute announce *Aug 18 04:37:06.239: Tun Sender: 1.1.1.1 LSP ID: 20 The tunnel priority ranges from 0 to 7. The smaller the priority, the higher the priority. We see that R5-PE2 assigns a 505 label to VPN customer route 6.6.6.6 . After the connection is successfully established, the interactive initialization message is started, and the initialization message contains various parameters. The other party also sends its own initialization message, and if it receives the parameters in the former initialization message, it sends a keep alive message to accept. At this point, the LDP neighbor relationship is established, and then the label mapping message can be transmitted to each other.