User guide

September 2009
OmniSwitch 6400/6850/6855/9000/9000E------ Release 6.4.2.R01 Page 15 of 79
MPLS OAM-LSP Ping/Traceroute
When an MPLS Label Switched Path (LSP) fails to deliver customer traffic, the failure is not always
detected by the MPLS control plane. To assist users with detecting and isolating traffic problems, such
as “black holes” or incorrect routing, the following MPLS OAM (Operations, Administration, and
Maintenance) tools are available:
• LSP Ping to perform connectivity checks.
• LSP Traceroute to perform hop-by-hop fault localization and path tracing.
LSP Ping and Traceroute are used to verify that packets associated with a particular Forwarding
Equivalence Class (FEC) actually end their MPLS path on a Label Switching Router (LSR) that is an
Egress LSR for that FEC.
MPLS Traps
The OmniSwitch AOS implementation of MPLS generates the following SNMP traps.
mplsXCup
mplsXCdown
vRtrMplsStateChange
vRtrMplsIfStateChange
vRtrMplsLspUp
vRtrMplsLspDown
vRtrLdpInstanceStateChange
vRtrLdpGroupIdMismatch
svcStatusChanged
sapStatusChanged
sdpBindStatusChanged
sdpStatusChanged
sapPortStateChangeProcessed
sdpBindStateChangeProcessed
sdpKeepAliveProbeFailure
sdpKeepAliveStarted
sdpKeepAliveStopped
NTP Server
Enhances the NTP functionality to allow the OmniSwitch to act as an NTP server. The OmniSwitch
software by default will be able to respond to NTP client requests, and establish a client/server peering
relationship. With the server cli commands now enabled, the Omniswitch can now also establish an active
peering relationship with another server, enable broadcast server functionality, disable a given IP for NTP
and employ MD5 authentication for clients and active peers.
Server Load Balancing - WRR
Enhances the Server Load Balancing to allow for the configuration of a Weighted Round Robin distribution
algorithm. When configured, SLB will distribute traffic according to the relative “weight” a server has
within an SLB cluster.
Hashing Control
Hashing helps in achieving better load balancing on the switch for features such as Link Aggregation,
ECMP and Server Load Balancing. Depending on the OmniSwitch configuration, this feature allows the
hashing mode to be configured to help improve switch load balancing performance.
There are two hashing algorithms available, Brief Mode or Extended Mode. In brief mode UDP/TCP ports
will not be included in the hashing algorithm and only source IP and destination IP addresses are
considered. Extended mode allows for additional bits to be used in the hashing algorithm as well as
providing the option of allowing UDP/TCP ports to be included in the hashing algorithm resulting in more
efficient load balancing.