Configure a Cisco Router to act like a Frame Relay Switch

First of all, information on this page is copied over from Tekcert website.  Another good link regarding configuring Cisco Router as a Frame Relay switch can be view from this link.
This page will show how to configure a regular Cisco Router to work like a Frame Relay switch.  This router will provide Frame Relay switching to 4 other remote routers.

The following is the diagram of the frame relay topology:

In the following section, I will only include the running config that make the router a frame relay switch:
   !
   interface Serial0/0
    description Link to R1
    no ip address
   encapsulation frame-relay
   serial restart-delay 0
   clock rate 64000
   no frame-relay inverse-arp
   frame-relay lmi-type ansi
   frame-relay intf-type dce
   frame-relay route 102 interface Serial0/1 201
  !
  interface Serial0/1
   description Link to R2
   no ip address
   encapsulation frame-relay
   serial restart-delay 0
   clock rate 64000
   no frame-relay inverse-arp
   frame-relay lmi-type ansi
   frame-relay intf-type dce
   frame-relay route 201 interface Serial0/0 102
   frame-relay route 203 interface Serial0/2 302
  !
  interface Serial0/2
   description Link to R3
   no ip address
   encapsulation frame-relay
   serial restart-delay 0
   clock rate 64000
   no frame-relay inverse-arp
   frame-relay lmi-type ansi
   frame-relay intf-type dce
   frame-relay route 302 interface Serial0/1 203
   frame-relay route 304 interface Serial0/3 403
  !
  interface Serial0/3
   description Link to R4
   no ip address
   encapsulation frame-relay
   serial restart-delay 0
   clock rate 64000
   no frame-relay inverse-arp
   frame-relay lmi-type ansi
   frame-relay intf-type dce
   frame-relay route 403 interface Serial0/2 304
  !

The most important line is the frame-relay route command on each of the serial interface command.
The syntax is listed on this link.  Here is the syntax of frame-relay route command:

"frame-relay route in-dlci interface out-interface-type out-interface-number out-dlci[voice-encap size]"

I would rephrase it as the following:

"frame-relay route source-dlci interface exit-interface-type mod/num destination-dlci"

The following are the frame-relay configuration from the remote routers with the proper DLCI.  Just a reminder, the connection is a point-to-point on frame relay.

Configuration from R1

!
interface Serial0/0
 description Link to Frame Relay Switch
 no ip address
 encapsulation frame-relay
 serial restart-delay 0
 no frame-relay inverse-arp
 frame-relay lmi-type ansi
!
interface Serial0/0.12 point-to-point
 ip address 10.1.1.1 255.255.255.252
 frame-relay interface-dlci 102
!

Configuration from R2

!
interface Serial0/0
 description Link to Frame Relay Switch
 no ip address
 encapsulation frame-relay
 serial restart-delay 0
 no frame-relay inverse-arp
 frame-relay lmi-type ansi
!
interface Serial0/0.12 point-to-point
 ip address 10.1.1.2 255.255.255.252
 frame-relay interface-dlci 201
!

interface Serial0/0.23 point-to-point
 ip address 10.1.1.5 255.255.255.252
 frame-relay interface-dlci 203
!

Configuration from R3

!
interface Serial0/0
 description Link to Frame Relay Switch
 no ip address
 encapsulation frame-relay
 serial restart-delay 0
 no frame-relay inverse-arp
 frame-relay lmi-type ansi
!
interface Serial0/0.23 point-to-point
 ip address 10.1.1.6 255.255.255.252
 frame-relay interface-dlci 302
!
interface Serial0/0.34 point-to-point
 ip address 10.1.1.9 255.255.255.252
 frame-relay interface-dlci 304
!

Configuration from R4

!
interface Serial0/0
 description Link to Frame Relay Switch
 no ip address
 encapsulation frame-relay
 serial restart-delay 0
 no frame-relay inverse-arp
 frame-relay lmi-type ansi
!
interface Serial0/0.34 point-to-point
 ip address 10.1.1.10 255.255.255.252
 frame-relay interface-dlci 403
!



Configuring Cisco Devices to Use a Syslog Server

Here are the configuration on Cisco Router to send logging information to Kiwi Syslog Server.

Informaiton:
Syslog server IP address: 192.168.1.200/24

On Cisco Router

Line 1. # config t
Line 2. # service timestamps log datetime msec localtime showtimezone
Line 3. # logging 192.168.1.200
Line 4. # logging trap 7
Line 5. # logging facility local 7
Line 6. # end
Line 7. # show logging

There are 7 options for line 4:
Emergency: 0
Alert: 1
Critical: 2
Error: 3
Warning: 4
Notice: 5
Infomational: 6
Debug: 7

Use the level 7 with caution, because it can generate a large amount of syslog traffic in a busy network.

Access Control Lists

Access-Control Lists (ACLs)

Access-Control Lists consist of one or multiple Access-Control Entries/Rules.
Each entries or rule has Permit/Deny condition.

Utilize Access-Control Lists for:
- to Identify Traffic
     Identify INTERESTING TRAFFIC, for example VPN or ISDN traffic
     Identify ROUTES to FILTER/ALLOW in ROUTING UPDATES
     Identify TRAFFIC for QoS purpose
- to Filter Traffic
     
 To Filter Traffic
- PERMIT is used to ALLOW TRAFFIC
- DENY is used to BLOCK TRAFFIC

To Identify Traffic
- PERMIT is used to INCLUDE TRAFFIC
- DENY is used to NOT INCLUDE TRAFFIC


NOTES:
ACL: Identify Traffic and Filter Traffic
IP Prefix-List: Match Routes (Not Traffic)
Route-Map: Advanced version of ACL.  Use for Permit/Deny Traffic, Perform Action and Modify Traffic

Distribute List: Filter Routing Updates.
     Distribute-List uses Access-List or Prefix-List

Configure Physical Voice Port

Configure Analog Voice Port

To configure CME voice port on router, first find out what voice ports is equipped on the router by running the following command:
Router# show voice port summary
FXS: Foreign eXchange Station
FXO: Foreign eXchange Office

For analog FXS port configuration, there are several configuration options:
- signaling:
   Ground start: must be configured and typically used when connecting to PBX equipment.
   Loop start: is mon by default and typically is used when connecting to telephone, modem or fax.
- Call progress tones: audio signaling that inform the caller how the call is progressing.
- Caller ID information.

Note: each ephone-dn configured using CME will show up as EXFS port.
Configuration example for fax line connected to FXS port
# show voice port summary
Find available FXS port for the fax line.
# config t
voice-port 0/0/0
signal loop start
cptone sg
station-id name 3rd floor fax
station-id number 555-1001

GNS3 - Switch Configuration

This post is about how to work with switching in GNS3.

Configuration on how to create VLAN:

     SW4#vlan database
     SW4(vlan)#vlan 10 name Data_VLAN
      VLAN 10 added:
         Name: Data_VLAN
     SW4(vlan)#vlan 20 name Voice_VLAN
      VLAN 20 added:
        Name: Voice_VLAN
     SW4(vlan)#vlan 100 name MGMT_VLAN
      VLAN 100 added:
       Name: MGMT_VLAN
     SW4(vlan)#apply
     APPLY completed.
     SW4(vlan)#exit

To join interfaces to VLAN

     SW4(config)#int range fa 0/3 - 5
     SW4(config-if-range)#switchport access vlan 10
     SW4(config-if-range)#switchport voice vlan 20
     SW4(config-if-range)#spanning-tree portfast
     SW4(config-if-range)#exit

To show the VLAN status

     SW4#show vlan-switch brief
     VLAN Name                                   Status    Ports
     ----       -------------------------------- --------- -------------------------------
     1          default                                 active    Fa0/6, Fa0/7, Fa0/8, Fa0/9
                                                                           Fa0/10, Fa0/11, Fa0/12, Fa0/13
                                                                           Fa0/14
     10        Data_VLAN                       active     Fa0/1, Fa0/2, Fa0/3, Fa0/4
                                                                           Fa0/5
     20        Voice_VLAN                     active
     100      MGMT_VLAN                  active    Fa0/15
     1002    fddi-default                         active
     1003    token-ring-default               active
     1004    fddinet-default                    active
     1005    trnet-default                        active
     SW4#

To save vlan configuration to vlan.dat and to make sure router retains vlan database after restarting GNS3

     SW4#dir nvram:
     Directory of nvram:/
       123  -rw-        1536                    <no date>  startup-config
       124  ----           0                    <no date>  private-config
     129016 bytes total (127428 bytes free)
     SW4#config t
     Enter configuration commands, one per line.  End with CNTL/Z.
     SW4(config)#vtp file nvram:vlan.dat
     Setting device to store VLAN database at filename nvram:vlan.dat.
     SW4(config)#do dir nvram:
     Directory of nvram:/
       123  -rw-        1536                    <no date>  startup-config
       124  ----           0                    <no date>  private-config
         1  -rw-         780                    <no date>  vlan.dat
     129016 bytes total (126404 bytes free)
     SW4(config)#do wr mem
     Building configuration...
     [OK]
     SW4(config)#

Upgrading Cisco Switch 3750G with Overwrite Command

This post is to show step-by-step IOS upgrade for 3750G Switch.

Device and software used for this update:
- Cisco Switch 3750G-24T
- Cisco Switch IOS 12.2.55-SE5
- TFTP server software

Scenario:
- Cisco Switch 3540G flash has 5.7MB free space
- Cisco Switch IOS 12.2.55-ES5 upgrade needs 11.54MB
- Not enough free space on flash storage

First,find out the flash free space and what version of IOS is running on the switch.

Switch# dir flash:
Directory of flash:/

    2  -rwx        3001  Jul 25 1993 05:53:33 +00:00  private-config.text
    4  -rwx        1644  Jun 28 1993 14:11:01 +00:00  vlan.dat
  459  drwx         192  Jun 16 1993 06:51:50 +00:00  c3750-ipbasek9-mz.122-35.SE2  458  -rwx       10170  Jul 25 1993 05:53:33 +00:00  config.text

15998976 bytes total (5790208 bytes free)
Switch#

As we can see here, the flash has 5.7MB of free space.  The new IOS image requires 11.54MB as stated on Cisco Website.

Next step is to download the Image tar file from Cisco website.

Saved the file to TFTP server folder and ready to upload it to Cisco Switch.
Since there is not enough free space in Flash storage, we have to overwrite the old IOS file with the new one.

First send an icmp ping command to the TFTP server to make sure it is reachable from the Switch.

Switch#ping 10.1.1.173

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.1.173, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/8 ms
Switch#

Next step is to upload and overwrite the current IOS with the new IOS (tar file).

Switch#archive download-sw /overwrite tftp://10.1.1.173/c3750-ipbaselmk9-tar.122-55.SE5.tar
Loading c3750-ipbaselmk9-tar.122-55.SE5.tar from 10.1.1.173 (via Vlan20): !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
[OK - 12697600 bytes]

Loading c3750-ipbaselmk9-tar.122-55.SE5.tar from 10.1.1.173 (via Vlan20): !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
examining image...
extracting info (106 bytes)
extracting c3750-ipbasek9-mz.122-55.SE5/info (681 bytes)
extracting info (106 bytes)

Stacking Version Number: 1.45

System Type:             0x00000000
  Ios Image File Size:   0x00B8B200
  Total Image File Size: 0x00C19A00  Minimum Dram required: 0x08000000
  Image Suffix:          ipbasek9-122-55.SE5
  Image Directory:       c3750-ipbasek9-mz.122-55.SE5
  Image Name:            c3750-ipbasek9-mz.122-55.SE5.bin
  Image Feature:         IP|LAYER_3|SSH|3DES|MIN_DRAM_MEG=128

Old image for switch 1: flash:c3750-ipbasek9-mz.122-35.SE2
  Old image will be deleted before download.

Deleting `flash:c3750-ipbasek9-mz.122-35.SE2' to create required space
Extracting images from archive into flash...
Once the overwrite is done, confirm that the Cisco Switch is booting from the new image.

Switch#dir flash:
Directory of flash:/

    2  -rwx        3001  Jul 25 1993 05:53:33 +00:00  private-config.text
    4  -rwx        1644  Jun 28 1993 14:11:01 +00:00  vlan.dat
  510  drwx         192   Aug 8 1993 09:32:45 +00:00  c3750-ipbasek9-mz.122-55.SE5
  458  -rwx       10170  Jul 25 1993 05:53:33 +00:00  config.text

15998976 bytes total (3331072 bytes free)
Switch#
The next step is to boot the image, save the configuration and reboot the system.

Switch#show boot
BOOT path-list      : flash:c3750-ipbasek9-mz.122-55.SE5/c3750-ipbasek9-mz.122-55.SE5.bin
Config file         : flash:/config.text
Private Config file : flash:/private-config.text
Enable Break        : no
Manual Boot         : no
HELPER path-list    :
Auto upgrade        : yes
Auto upgrade path   :
Switch#
Switch#wr
Building configuration...
[OK]
Switch#reload
Proceed with reload? [confirm]

ASA 5505 Licensed Host Limit Reached

ASA 5505 basic license comes with only 10 internal host connection.  If you have more than 10 devices that need access to the internet, the 11th device will not get a NATed.
For short term solution, you can reload the ASA configuration. 
But to permanently fix this issue, you have to get a different license key from Cisco.  For example upgrade from basic 10 users to 50 users license.
To check the status of the license limit, use this command:
show local-host