Section 6: DLSw (4 Points)

• Configure DLSw between VLAN_11 and VLAN_33. Use TCP encapsulation.

If you configured this correctly as shown in Example 4-37, you have scored 2 points.

Example 4-37 shows the basic configuration to configure the DLSw. Because it is a "bridge" environment, you need to enable Spanning Tree Protocol, which you accomplish using the bridge protocol command. Also, the show commands tell you if the DLSw peers are up and running. Look for the state field from show dlsw peers and if it is "CONNECT" it is acceptable; otherwise, double check your configuration for mistakes in IP addressing or missing configuration. Double check on both sides, R1 and R3.

Example 4-37. R1 and R3 Basic DLSw Configuration

 R1#show run ! dlsw local-peer peer-id 160.10.1.1 dlsw remote-peer 0 tcp 160.10.3.3 dlsw bridge-group 1 ! interface Ethernet0/0  ip address 160.10.11.1 255.255.255.0  bridge-group 1 ! ! ! bridge 1 protocol ieee ! ! R3#show run ! ! dlsw local-peer peer-id 160.10.3.3 dlsw remote-peer 0 tcp 160.10.1.1 dlsw bridge-group 1 ! ! ! interface FastEthernet0/1  ip address 160.10.33.3 255.255.255.0  bridge-group 1 ! ! bridge 1 protocol ieee ! ! R1#show dlsw peers Peers:                state     pkts_rx   pkts_tx  type  drops ckts TCP   uptime  TCP 160.10.3.3      CONNECT       3298      3298  conf      0    0   0    1d03h Total number of connected peers: 1 Total number of connections:     1 R1# ! ! R3#show dlsw peers Peers:                state     pkts_rx   pkts_tx  type  drops ckts TCP   uptime  TCP 160.10.1.1      CONNECT       3299      3299  conf      0    0   0    1d03h Total number of connected peers: 1 Total number of connections:     1 R3# 

• You have some users exchanging data through your DLSw connection, but you don't want to compromise the IP traffic, because the DLSw is not your high priority. Configure your DLSw peers to reserve bandwidth and so that they do not use more than 60 kbps as an average bit rate and maximum burst rate of 30 kbps.

If you configured this correctly as shown in Example 4-38, you have scored 1 point.

Example 4-38 shows the configuration for RSVP or Bandwidth Reservation to DLSw sessions. Another useful command is show ip rsvp reservation, which shows if the bandwidth is reserved; however, you must have a DLSw session exchange traffic to see any output.

Example 4-38. R1 and R3 RSVP Configuration

 R1#show run ! dlsw rsvp 60 30 ! ________________________________________________________________ R3#sh run ! ! dlsw rsvp 60 30 ! 

• The SNA servers exchanging data between VLAN_11 and VLAN_33 have a high CPU utilization and, therefore, cause unexpected longer timeouts. To adjust the situation, configure a timeout of 10 minutes to accommodate an explorer response before marking a resource unreachable.

If you configured this correctly as shown in Example 4-39, you have scored 1 point.

Example 4-39 shows the configuration that adjusts the "timer" for the explorer packets from the default of 6 seconds to 600 seconds or 10 minutes.

Example 4-39. R1 and R3 RSVP Configuration

 R1#show run ! dlsw timer sna-explorer-timeout 600 ! ! ! ________________________________________________________________ R3#show run ! ! dlsw timer sna-explorer-timeout 600 ! !