I have a Cisco 4506/Sup V with approx. 30 VLANs all with HSRP virtual interfaces using rapid spanning tree. S/W revision is 12.2
Pinging the local HSRP interface in a VLAN from a PC with 500ms delays between each ping has good latency response, average is <2ms (over 30000 pings). However the max ping can sometimes be up to 3-500ms RTT.
Should this be expected? I've done a 'show proc cpu' and CPU usage seems fine. Also a 'show platform health' and from what I can tell the values seem reasonable. There are no ACLs used, basic QoS is implemented (expedite TX-queue 3).
I have seen this on loaded systems, but this system is particularly lightly loaded (less than 5mbps of traffic across it. It would seem about 1-2 packets in about 1-2000 pings will hit between 100-500ms.
I hear you. However, every ping destined to the router/switch has to be process switched and if the processor is busy processing some other traffic at the time the ICMP packet arrived then it would be delayed as it's not considered high priority. In general, the average RTT is a good reflection of the RTT of pings.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
Introduction Featured Speakers Luis Espejel is the Telecommunications
Manager of IENova, an Oil & Gas company. Currently he works with Cisco
IOS® and Cisco IOS XE platforms, and NX to some extent. He has also
worked as a Senior Engineer with the Routing P...
In this session you can learn more about Layer 3 multicast and the best
practices to identify possible threats and take security measures. It
provides an overview of basic multicast, the best security practices for
use of this technology, and recommendati...