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Description of problem:
snapshot-info report "error: unknown procedure: 272" when ssh connect old libvirt server ,but snapshot-info works well

Version-Release number of selected component (if applicable):
libvirt-0.9.13-3.el6.x86_64

How reproducible:
100%

Steps to Reproduce:

1) perpare a guest with snapshot in old server 
#rpm -q libvirt
libvirt-0.9.10-21.el6_3.3.x86_64

2) connect old server with new client
#rpm -q libvirt
libvirt-0.9.13-3.el6.x86_64

# virsh -c qemu+ssh://10.66.5.12/system
root.5.12's password:
Welcome to virsh, the virtualization interactive terminal.

Type:  'help' for help with commands
       'quit' to quit

virsh # snapshot-info qcow2 --current
Name:           1319695362
Domain:         qcow2
Current:        yes
State:          running
Parent:         -
Children:       0
Descendants:    0
Metadata:       yes

virsh # snapshot-info qcow2
error: --snapshotname or --current is required
error: unknown procedure: 272


Actual results:
report unknow procedure error

Expected results:
if snapshot-info can work well , do not need report error

Additional info:

Fixed upstream with two commits:

commit 2751ab289bad78ff3da59d164859598ef52d7802
Author: Peter Krempa <pkrempa>
Date:   Thu Jul 26 11:24:30 2012 +0200

    virsh: Fix error resetting on fallback paths
    
    On some fallback paths in virsh, error reported by the previously failed
    API is cleared by virResetLastError() that doesn't free error stored by
    virsh. This patch changes this to clear it using vshResetLibvirtError().

commit 3df9626c404573d94580a2711e2d7a3e1aef7800
Author: Peter Krempa <pkrempa>
Date:   Wed Jul 25 13:41:49 2012 +0200

    virsh: Refactor error clearing on graceful fallback paths

Verify this bug as Comment 0 with :
libvirt-0.10.0-0rc0.el6.x86_64

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHSA-2013-0276.html