Booting XM Images on Non-XM 2600 Series Routers
Introduction:
One of the limitations of the older 2600 series routers (2610/2611/2620/2621) is that they lack the memory capacity to run newer IOS images. Within the scope of the CCIE Routing & Switching Lab Exam this translates to the lack of OSPFv3 support for IPv6. Luckily for us however the older 2600 series routers are essentially the same platform as the 2600XM routers, simply with less processing power and memory capacity. What this means is that the 2600 series routers can boot 2600XM images, and therefore run IOS versions that includes OSPFv3 support. In order to accomplish this we will use the "tftpdnld -r" command from rommon to boot an IOS image into RAM. Since the image will be running from RAM a TFTP download will be required every time the router is rebooted.
Configuration:
Below we see a 2610 router running the 12.2(15)T7 IP Plus image. While it does support IPv6 routing it lacks OSPFv3 support.
Router#show version Cisco Internetwork Operating System Software IOS (tm) C2600 Software (C2600-J1S3-M), Version 12.2(15)T7, RELEASE SOFTWARE (fc2) TAC Support: http://www.cisco.com/tac Copyright (c) 1986-2003 by cisco Systems, Inc. Compiled Sat 09-Aug-03 07:18 by ccai Image text-base: 0x80008098, data-base: 0x8195144C ROM: System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1) Router uptime is 10 hours, 58 minutes System returned to ROM by power-on System image file is "flash:c2600-j1s3-mz.122-15.T7.bin" cisco 2610 (MPC860) processor (revision 0x202) with 59392K/6144K bytes of memory. Processor board ID JAD03337409 (4221326695) M860 processor: part number 0, mask 49 Bridging software. X.25 software, Version 3.0.0. TN3270 Emulation software. 1 Ethernet/IEEE 802.3 interface(s) 2 Serial network interface(s) 32K bytes of non-volatile configuration memory. 16384K bytes of processor board System flash (Read/Write) Configuration register is 0x2142 (will be 0x2102 at next reload) Router#conf t Enter configuration commands, one per line. End with CNTL/Z. Router(config)#ipv6 unicast-routing Router(config)#ipv6 router ospf 1 Router(config)#interface e0/0 Router(config-if)#ipv6 ospf 1 area 0 ^ % Invalid input detected at '^' marker. Router(config-if)#end Router#
In order to boot the XM image we first have to boot into rommon. To accomplish this reload the router and then press CTRL-BREAK as the router begins to boot.
Router#reload System configuration has been modified. Save? [yes/no]: n Proceed with reload? [confirm] *Mar 1 10:59:13.751: %SYS-5-RELOAD: Reload requested by console. System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1) Copyright (c) 1999 by cisco Systems, Inc. TAC:Home:SW:IOS:Specials for info PC = 0xfff0a530, Vector = 0x500, SP = 0x680127b0 C2600 platform with 65536 Kbytes of main memory PC = 0xfff0a530, Vector = 0x500, SP = 0x80004864 monitor: command "boot" aborted due to user interrupt rommon 1 >
Next set the environment variables for loading an IOS image via tftp.
rommon 1 > IP_ADDRESS=192.10.4.1 rommon 2 > IP_SUBNET_MASK=255.255.255.0 rommon 3 > DEFAULT_GATEWAY=192.10.4.254 rommon 4 > TFTP_SERVER=192.10.4.254 rommon 5 > TFTP_FILE=2600xm.bin
Next issue the "tftpdnld -r" command. Note that the -r switch is required to instruct the router to load the image to RAM instead of writing it to flash.
rommon 6 > tftpdnld -r IP_ADDRESS: 192.10.4.1 IP_SUBNET_MASK: 255.255.255.0 DEFAULT_GATEWAY: 192.10.4.254 TFTP_SERVER: 192.10.4.254 TFTP_FILE: 2600xm.bin .... Receiving 2600xm.bin from 192.10.4.254 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!! File reception completed. program load complete, entry point: 0x80008000, size: 0x1176b34 Self decompressing the image : ########################################### ########################################################################## ########################################################################## ########################################################################## ###################################################################### [OK] Smart Init is disabled. IOMEM set to: 10 Configured I/O memory percentage was too large. Using 10 percent iomem. Restricted Rights Legend Use, duplication, or disclosure by the Government is subject to restrictions as set forth in subparagraph (c) of the Commercial Computer Software - Restricted Rights clause at FAR sec. 52.227-19 and subparagraph (c) (1) (ii) of the Rights in Technical Data and Computer Software clause at DFARS sec. 252.227-7013. cisco Systems, Inc. 170 West Tasman Drive San Jose, California 95134-1706 Cisco Internetwork Operating System Software IOS (tm) C2600 Software (C2600-JS-M), Version 12.2(15)T14, RELEASE SOFTWARE (fc4) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2004 by cisco Systems, Inc. Compiled Sat 28-Aug-04 06:48 by cmong Image text-base: 0x80008098, data-base: 0x81D1B400 cisco 2610 (MPC860) processor (revision 0x202) with 59392K/6144K bytes of memory. Processor board ID JAD03337409 (4221326695) M860 processor: part number 0, mask 49 Bridging software. X.25 software, Version 3.0.0. SuperLAT software (copyright 1990 by Meridian Technology Corp). TN3270 Emulation software. 1 Ethernet/IEEE 802.3 interface(s) 2 Serial network interface(s) 32K bytes of non-volatile configuration memory. 16384K bytes of processor board System flash (Read/Write) Warning: Attempting a memory percentage that does not provide enough Processor memory for the currently running image. If you save your running-config now, this version of software may not be able to run. Press RETURN to get started!
We can now see that the router has booted and is running IOS 12.2(15)T14 Enterprise Plus, which is only officially supported as a 2600XM image. Most importantly our 2610 router now has OSPFv3 support.
Router>en Router#conf t Enter configuration commands, one per line. End with CNTL/Z. Router(config)#ipv6 unicast-routing Router(config)#ipv6 router ospf 1 Router(config-rtr)#? area OSPF area parameters auto-cost Calculate OSPF interface cost according to bandwidth compatible OSPF compatibility list default Set a command to its defaults default-information Distribution of default information default-metric Set metric of redistributed routes discard-route Enable or disable discard-route installation distance Administrative distance distribute-list Filter networks in routing updates exit Exit from IPv6 routing protocol configuration mode ignore Do not complain about specific event log-adjacency-changes Log changes in adjacency state maximum-paths Forward packets over multiple paths no Negate a command or set its defaults passive-interface Suppress routing updates on an interface redistribute Redistribute IPv6 prefixes from another routing protocol router-id router-id for this OSPF process summary-prefix Configure IPv6 summary prefix timers Adjust routing timers Router(config-rtr)#interface e0/0 Router(config-if)#ipv6 ospf ? <1-65535> Process ID cost Interface cost database-filter Filter OSPF LSA during synchronization and flooding dead-interval Interval after which a neighbor is declared dead demand-circuit OSPF demand circuit flood-reduction OSPF Flood Reduction hello-interval Time between HELLO packets mtu-ignore Ignores the MTU in DBD packets neighbor OSPF neighbor network Network type priority Router priority retransmit-interval Time between retransmitting lost link state advertisements transmit-delay Link state transmit delay
Note that the router displays a warning that it is short on processor memory. Ensure to save your configuration early and often in order to avoid losing your work due to a router crash.
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