Cisco Cisco MGX 8880 Media Gateway Release Notes

The following limitations apply to the DSCP marking of management packets on the RPM_XF 
management back card:

The RPM-XF does not support DSCP marking for the interface to the MGX switch cell bus.

The RPM-XF management back card can be used for only management traffic, not data traffic.

Network management systems (NMS) can manage software images stored in boot flash using SNMP 
when the device supports the CISCO-FLASH-MIB. The RPM-XF supports the CISCO-FLASH-MIB in 
Cisco IOS Release 12.4(14)T and later releases. For MGX 8800/8900 multiservice switches, the NMS 
can query objects defined in the CISCO-FLASH-MIB through the PXM management interface or the 
RPM-XF management interface.

Simple Network Management Protocol Version 3 (SNMPv3) is an standards-based protocol for network 
management. SNMPv3 provides secure access to devices using a combination of authentication and 
encryption of packets over the network. This assures that data can be collected securely from SNMP 
devices and that configuration messages cannot be viewed or altered. 

The security features provided in SNMPv3 are: 

Message integrity—Ensuring that a packet has not been tampered with in-transit. 

Authentication—Determining that the message is from a valid source. 

Encryption—Scrambling the contents of a packet to prevent it from being seen by an unauthorized 
source. 

The large number of traps a large system can generate can degrade the performance of a network 
management system. The trap squelch feature helps limit the number of traps that Cisco MGX switches 
generate. You can either block all traps of a specific type or limit the rate of specified traps.

The following limitations apply:

The squelch list holds up to 200 trap types.

The minimum value of the sampling interval is five minutes and the maximum value is 30 minutes.