Dynamic Access Lists
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Lab 28: DLSw+ Reachability, Border Peers, Demand Peers, and Resilient Peers ”Part IILab WalkthroughBegin by attaching the four routers in a back-to-back manner as illustrated in Figure 13-50. When the physical connections are complete, assign IP addresses to all LAN and WAN interfaces, as depicted in Figure 13-50. To configure the WAN interfaces, one end of the link must be configured as DCE if you are using back-to-back cables. Use the interface command clock rate speed to set one side of the link to be DCE. The WAN protocol is HDLC, so no further configuration is necessary to make the link active. The model specifies that you can have only one serial link active at a time between the us_border and us_tour routers. To configure one link to back up the other, use the backup interface command. Example 13-67 lists the serial configuration of the us_border router. Example 13-67 Serial Configuration of the us_border Routerhostname us_border ! <<<text omitted>>> ! interface Serial0 ip address 128.10.101.1 255.255.255.252 no fair-queue clockrate 64000 ! interface Serial1 backup delay 0 0 backup interface Serial7 ip address 128.10.10.6 255.255.255.252 clockrate 64000 ! <<<text omitted>>> ! interface Serial7 ip address 128.10.10.1 255.255.255.252 clockrate 64000 ! <<<text omitted>>> ! router eigrp 2001 network 128.10.0.0 no auto-summary When you can ping all of the routers' local interfaces, configure EIGRP as the routing protocol. This model has two major subnets; thus, the canada_border router will need two network statements, one for 128.20.0.0 and one for 128.10.0.0. Example 13-68 lists the EIGRP configuration of the canada_border router. Example 13-68 EIGRP Configuration of the canada_border Router! router eigrp 2001 network 128.10.0.0 network 128.20.0.0 no auto-summary ! Begin the DLSw configuration by configuring the peer between the U.S. routers first. Recall the following four-step process for configuring DLSw:
Begin by configuring loopback addresses on all the routers. You will use these for the local and remote peers. Step 2 calls for configuring local peers. The U.S. routers will be in peer group 10. To the local peer to a peer group , use the group keyword on the local-peer statement. The us_border router actually will be the border peer for peer group 10. To configure a border peer, simply include the keyword border on the local-peer statement. The Canada routers will be in peer group 20, and the canada_border router will be the border peer for that peer group. To configure transparent bridging to satisfy Step 3, add the Ethernet interface to a bridge group with the interface command bridge-group x. STP also must be enabled with the global command bridge 1 protocol IEEE, where 1 is the transparent bridge number. The transparent bridging portion for all of the router configurations will be identical. Example 13-69 lists the transparent bridging configuration of the us_tour router. This example also demonstrates the command needed to attach the bridge group to a DLSw domain. Example 13-69 Transparent Bridging Configurationdlsw bridge-group 1 Step 4 involves configuring a TCP peer from the us_tour router to the us_border router. This peer needs to be configured so that it will not drop when a serial line converges. To prevent a peer from dropping during a link failure, assign a timeout 500 value and a keepalive 0 value to the remote peer on both sides of the link. The us_tour router will need to be configured for a peer-on-demand from the canada_tour router. To configure a peer-on-demand, use the following global command: us_tour(config)# dlsw peer-on-demand-defaults tcp-queue-max 50 The last DLSw command that you need to configure on the us_tour router is for DLSw reachability. To advertise reachability to the station US_STATION, use the following DLSw command: us_tour(config)# dlsw icanreach netbios-name US_STATIONS Example 13-70 shows the complete configuration of the us_tour router. Example 13-70 Configuration of the us_tour Routerhostname us_tour ! <<<text omitted>>> ! dlsw local-peer peer-id 128.10.128.9 group 10 dlsw remote-peer 0 tcp 128.10.128.1 keepalive 0 timeout 500 dlsw icanreach netbios-name US_STATIONS dlsw peer-on-demand-defaults tcp-queue-max 50 dlsw bridge-group 1 ! ! interface Loopback20 ip address 128.10.128.9 255.255.255.252 no ip directed-broadcast ! interface Ethernet0 ip address 128.10.1.1 255.255.255.0 no ip directed-broadcast media-type 10BaseT bridge-group 1 ! <<<text omitted>>> ! interface Serial0 ip address 128.10.10.5 255.255.255.252 no ip directed-broadcast no ip mroute-cache ! interface Serial1 ip address 128.10.10.1 255.255.255.252 no ip directed-broadcast ! <<<text omitted>>> ! router eigrp 2001 network 128.10.0.0 no auto-summary ! <<<text omitted>>> ! bridge 1 protocol ieee ! The us_border peer has one additional peer configured to the canada_border router. Example 13-71 shows the complete configuration of the us_border router. Example 13-71 Configuration of the us_border Routerhostname us_border ! dlsw local-peer peer-id 128.10.128.1 group 10 border dlsw remote-peer 0 tcp 128.10.128.9 keepalive 0 timeout 500 dlsw remote-peer 0 tcp 128.10.128.5 dlsw bridge-group 1 ! interface Loopback20 ip address 128.10.128.1 255.255.255.252 ! interface Ethernet0 ip address 128.10.100.1 255.255.255.0 bridge-group 1 ! interface Serial0 ip address 128.10.101.1 255.255.255.252 no fair-queue clockrate 64000 ! interface Serial1 backup delay 0 0 backup interface Serial7 ip address 128.10.10.6 255.255.255.252 clockrate 64000 ! <<<text omitted>>> ! interface Serial7 ip address 128.10.10.1 255.255.255.252 clockrate 64000 ! <<<text omitted>>> ! router eigrp 2001 network 128.10.0.0 no auto-summary ! <<<text omitted>>> ! bridge 1 protocol ieee To view the static NetBIOS reachability from the us_border peer, enter the show dlsw reachability command as demonstrated in Example 13-72. You should now see the NetBIOS name US_STATIONS being reported to the border router. Example 13-72 Viewing the Reachability on the us_border Routerus_border# show dlsw reachability DLSw Remote MAC address reachability cache list Mac Addr status Loc. port rif DLSw Local MAC address reachability cache list Mac Addr status Loc. peer 0000.613c.dc82 FOUND REMOTE 128.10.128.5(2065) DLSw Local NetBIOS Name reachability cache list NetBIOS Name status Loc. port rif DLSw Remote NetBIOS Name reachability cache list NetBIOS Name status Loc. peer US_STATIONS UNCONFIRM REMOTE 128.10.128.9(2065) us_border# The configuration of canada_border router and canada_tour routers mirrors that of the two U.S. routers. Example 13-73 shows the complete configurations of these routers. Example 13-73 Configurations of the Canada Routershostname canada_border ! <<<text omitted>>> ! dlsw local-peer peer-id 128.10.128.5 group 20 border dlsw remote-peer 0 tcp 128.10.128.1 dlsw remote-peer 0 tcp 128.10.128.13 dlsw bridge-group 1 ! ! interface Loopback20 ip address 128.10.128.5 255.255.255.252 ! interface Ethernet0 ip address 128.20.100.1 255.255.255.0 bridge-group 1 ! interface Serial0 ip address 128.10.101.2 255.255.255.252 no fair-queue ! interface Serial1 ip address 128.20.10.2 255.255.255.252 clockrate 64000 ! <<<text omitted>>> ! router eigrp 2001 network 128.10.0.0 network 128.20.0.0 no auto-summary ! <<<text omitted>>> ! bridge 1 protocol ieee ! _______________________________________________________________________ hostname canada_tour ! ! dlsw local-peer peer-id 128.10.128.13 group 20 dlsw remote-peer 0 tcp 128.10.128.5 dlsw icanreach netbios-name CANADA_STATIONS dlsw peer-on-demand-defaults tcp-queue-max 50 dlsw bridge-group 1 ! <<<text omitted>>> ! interface Loopback20 ip address 128.10.128.13 255.255.255.252 ! interface Ethernet0 ip address 128.20.1.1 255.255.255.0 bridge-group 1 ! interface Serial0 ip address 128.20.10.1 255.255.255.252 no fair-queue ! <<<text omitted>>> ! router eigrp 2001 network 128.20.0.0 network 128.10.0.0 no auto-summary ! <<<text omitted>>> ! bridge 1 protocol ieee To verify the configuration, view the DLSw reachability on the border routers. You should see the static ICANREACH from the peers within the same group as the border peer. As mentioned previously, a Windows workstation is a great way to test DLSw. By putting workstations on the various LAN segments, you can generate traffic, create circuits, and force explorers. Example 13-74 shows a workstation connected to the DLSw domain, issuing an explorer for the NetBIOS station BORDER-PATROL. Example 13-74 Verifying the Configurationus_border# show dlsw reachability DLSw Remote MAC address reachability cache list Mac Addr status Loc. port rif DLSw Local MAC address reachability cache list Mac Addr status Loc. peer 0000.613c.dc82 FOUND REMOTE 128.10.128.5(2065) DLSw Local NetBIOS Name reachability cache list NetBIOS Name status Loc. port rif BORDER-PATROL SEARCHING LOCAL DLSw Remote NetBIOS Name reachability cache list NetBIOS Name status Loc. peer TOURIST FOUND REMOTE 128.10.128.5(2065) US_STATIONS UNCONFIRM REMOTE 128.10.128.9(2065) us_border# Verifying the DLSw peer connections and DLSw capabilities is another way to ensure that the DLSw network is operating. Example 13-75 illustrates the show dlsw peer command on the canada_border router. Example 13-75 Verifying the Peers on the canada_border Router canada_border# show dlsw peer Peers: state pkts_rx pkts_tx type drops ckts TCP uptime TCP 128.10.128.1 CONNECT 65 85 conf 0 0 0 00:32:20 TCP 128.10.128.13 CONNECT 67 103 conf 0 0 0 00:33:00 Total number of connected peers: 2 Total number of connections: 2 canada_border# |
Attach bridge 1 to DLSW | < Free Open Study > |
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