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An error message '%Cannot communicate boot variable to slave' appears when issuing the write memory command on a Cisco 7500 series router due to a communication issue with the slave RSP
This issue occurs on a Cisco 7500 series router with two Route Switch Processors (RSPs). This may be due to the slave RSP being in a halted state, a communication issue between the master and slave RSP on the Inter-Process Communication (IPC) bus, or a hardware issue.
Check if the slave RSP is halted by issuing the show versioncommand. Look toward the end of the output for the line regarding the slave, as shown in this example:
Cisco Internetwork Operating System Software
IOS (tm) RSP Software (RSP-JSV-M), Version 12.2(13)T, RELEASE SOFTWARE (fc1)
TAC Support: http://www.cisco.com/tac
Copyright (c) 1986-2002 by cisco Systems, Inc.
Compiled Sat 16-Nov-02 02:29 by ccai
Image text-base: 0x60010948, data-base: 0x61F00000
ROM: System Bootstrap, Version 12.0(20011126:200409)
[mssunil-RSP16_BENGAL_120S 251], DEVELOPMENT SOFTWARE
BOOTLDR: RSP Software (RSP-BOOT-M), Experimental Version 12.1(20020118:012025)
Router uptime is 7 hours, 22 minutes
System returned to ROM by reload at 11:26:00 UTC Fri Feb 21 2003
System image file is "disk0:rsp-jsv-mz.122-13.t.bin"
cisco RSP16 (R7000A) processor with 131072K/8216K bytes of memory.
R7000 CPU at 400Mhz, Implementation 39, Rev 3.3, 256KB L2, 2048KB L3 Cache
Last reset from power-on
G.703/E1 software, Version 1.0.
G.703/JT2 software, Version 1.0.
X.25 software, Version 3.0.0.
SuperLAT software (copyright 1990 by Meridian Technology Corp).
TN3270 Emulation software.
5 VIP2 R5K controllers (7 FastEthernet)(8 Ethernet)(32 Serial).
8 Ethernet/IEEE 802.3 interface(s)
7 FastEthernet/IEEE 802.3 interface(s)
32 Serial network interface(s)
2043K bytes of non-volatile configuration memory.
47040K bytes of ATA PCMCIA card at slot 0 (Sector size 512 bytes).
16384K bytes of Flash internal SIMM (Sector size 256K).
Slave in slot 2 is halted.
Configuration register is 0x2102
2. If the slave is halted, issue the slave reload global configuration command, as shown in this example:
3. After the slave reload is complete, issue the write memory or copy running-config startup-config command to check if the error message reoccurs.
Note: Even if the slave does not appear to be halted, issuing the slave reloadcommand may resolve the problem. This is because the issue might not be a halted slave, but a communication problem across the bus between the master and slave RSPs.
If after issuing the slave reload command, the error message still appears, physically remove and reinstall the slave RSP.
If after reseating the slave RSP, the error continues, the slave RSP may be defective and needs to be replaced.