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Cisco ASA Configuration
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Example: Creating the Contexts
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I ll now create and set up my two contexts ( admin and ctx ):
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ciscoasa(config)# admin-context admin Creating context 'admin' Done (1) ciscoasa(config)# context admin ciscoasa(config-ctx)# allocate-interface e0/01 ciscoasa(config-ctx)# allocate-interface e0/11 ciscoasa(config-ctx)# config-url flash:/admincfg WARNING: Could not fetch the URL flash:/admincfg INFO: Creating context with default config INFO: Admin context will take some time to come up please wait ciscoasa(config-ctx)# exit ciscoasa(config)# context ctx Creating context 'ctx' Done (2) ciscoasa(config-ctx)# allocate-interface e0/02 ciscoasa(config-ctx)# allocate-interface e0/12 ciscoasa(config-ctx)# config-url flash:/ctxcfg WARNING: Could not fetch the URL flash:/ctxcfg INFO: Creating context with default config ciscoasa(config-ctx)# exit ciscoasa(config)# show context Context Name Class Interfaces URL *admin default Ethernet0/01,Ethernet0/11 flash:/admincfg ctx default Ethernet0/02,Ethernet0/12 flash:/ctxcfg Total active Security Contexts: 2
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Notice that I allocated my VLAN subinterfaces to the respective contexts as well as specified the location of the configuration files for the contexts
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Example: Configuring the Admin Context
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Now I ll set up the configuration and policies for the admin context:
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ciscoasa(config)# changeto context admin ciscoasa/admin(config)# ciscoasa/admin(config)# interface e0/01 ciscoasa/admin(config-if)# nameif outside INFO: Security level for "outside" set to 0 by default ciscoasa/admin(config-if)# security-level 0 ciscoasa/admin(config-if)# ip address 192168111 2552552550 ciscoasa/admin(config-if)# no shutdown ciscoasa/admin(config-if)# exit ciscoasa/admin(config)# interface e0/11 ciscoasa/admin(config-if)# nameif inside
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Contexts
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INFO: Security level for "inside" set to 100 by default ciscoasa/admin(config-if)# security-level 100 ciscoasa/admin(config-if)# ip address 1001111 2552552550 ciscoasa/admin(config-if)# no shutdown ciscoasa/admin(config-if)# exit ciscoasa/admin(config)# route outside 0000 0000 19216811254 ciscoasa/admin(config)# nat-control ciscoasa/admin(config)# nat (inside) 1 0000 0000 ciscoasa/admin(config)# global (outside) 1 interface INFO: outside interface address added to PAT pool ciscoasa/admin(config)# access-list ACLoutside permit icmp any any ciscoasa/admin(config)# access-list ACLoutside deny ip any an ciscoasa/admin(config)# access-group ACLoutside in interface outside
Notice that when I executed the changeto command, the prompt changed to include the name of the context (This is what the hostname command defaults to within the context) I ve set up a real simple configuration: configuring the interfaces with IP addresses, logical names, and security levels, defining a static route, setting up a PAT translation policy for outbound traffic, and allowing ICMP traffic to flow inbound
Example: Configuring the ctx Context
Next I ll switch to the ctx context and set it up:
ciscoasa/admin(config)# changeto context ctx ciscoasa/ctx(config)# ciscoasa/ctx(config)# interface e0/02 ciscoasa/ctx(config-if)# nameif outside INFO: Security level for "outside" set to 0 by default ciscoasa/ctx(config-if)# security-level 0 ciscoasa/ctx(config-if)# ip address 192168121 2552552550 ciscoasa/ctx(config-if)# no shutdown ciscoasa/ctx(config-if)# exit ciscoasa/ctx(config-if)# interface e0/12 ciscoasa/ctx(config-if)# nameif inside INFO: Security level for "inside" set to 100 by default ciscoasa/ctx(config-if)# security-level 100 ciscoasa/ctx(config-if)# ip address 1002111 2552552550 ciscoasa/ctx(config-if)# no shutdown ciscoasa/ctx(config-if)# exit ciscoasa/ctx(config)# route outside 0000 0000 19216812254 ciscoasa/ctx(config)# nat-control ciscoasa/ctx(config)# nat (inside) 1 0000 0000 ciscoasa/ctx(config)# global (outside) 1 interface INFO: outside interface address added to PAT pool
Cisco ASA Configuration
ciscoasa/ctx(config)# access-list ACLoutside permit icmp any any ciscoasa/ctx(config)# access-list ACLoutside deny ip any any ciscoasa/ctx(config)# access-group ACLoutside in interface outside
This configuration is similar to the admin context configuration
Example: Saving the Appliance Configuration
Last, I ll switch to the system area and save the configuration of everything on the appliance:
ciscoasa/ctx(config)# changeto system ciscoasa(config)# ciscoasa(config)# write memory all Building configuration Saving context : system : (000/002 Contexts saved) Cryptochecksum: 470df27f 7c312655 ba32399a fe96cb77 996 bytes copied in 0820 secs Saving context : admin : (001/002 Contexts saved) Cryptochecksum: 83a9938b ec06cf12 7d579f12 e7808459 1350 bytes copied in 0840 secs Saving context : ctx : (002/002 Contexts saved) Cryptochecksum: 0dac15dc 927b7011 a126adc6 00d45ab4 1348 bytes copied in 0860 secs [OK]
NOTE Because no interfaces were shared between contexts, the MAC addresses on the subinterfaces could be the same or different; however, if an interface were shared between contexts, make sure you execute the mac-address auto command in the appliance system area
Failover
Cisco ASA Configuration
his chapter will introduce one of the advanced features that has been supported on the appliances for quite some time: failover Failover provides redundancy between appliances, so if one appliance fails, you can have a redundant appliance take over for the failed one The topics discussed in this chapter include An introduction to failover, including the failover types, hardware, software, and license requirements, failover restrictions, and software upgrades The two implementations of failover: active/standby and active/active Cabling the appliances that will participate in failover How appliances communicate with each other about failover, how they detect problems, and when failover can occur Configuring active/standby failover Configuring active/active failover
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