my personal notes from testing vsm-500 from a few years ago... *** my testing showed good with pings, BUT TERRIBLE and NON-existent web surfing until changing MTU of vnics from 1514 to 9216
interface TenGigE0/3/1/0 description vsm mtu 9216 ! interface TenGigE0/3/1/1 description vsm mtu 9216 ! interface TenGigE0/3/1/2 description vsm mtu 9216 ! interface TenGigE0/3/1/3 description vsm mtu 9216 ! interface TenGigE0/3/1/4 description vsm mtu 9216 ! interface TenGigE0/3/1/5 description vsm mtu 9216 ! interface TenGigE0/3/1/6 description vsm mtu 9216 ! interface TenGigE0/3/1/7 description vsm mtu 9216 ! interface TenGigE0/3/1/8 description vsm mtu 9216 ! interface TenGigE0/3/1/9 description vsm mtu 9216 ! interface TenGigE0/3/1/10 description vsm mtu 9216 ! interface TenGigE0/3/1/11 description vsm mtu 9216 ---------------------------------------------------------------------------------------------- also i have a document but i can't find it online anywhere... it's titled "ASR9K CGv6 on VSM troubleshooting guide" there is a section subtitled..."3. VSM packet flow troubleshooting" NOTE 1 : Be aware about CSCuo63064 which explain the packet drops for packet which supposed to be fragmented on VSM Symptom: Packets requiring fragmentation are silently dropped with DROP_FRM_FRM_ERR_XAUI9 error count Conditions: Observed with NAT44 on VSM with packet sizes above 1514 bytes. Workaround: Increase the interface MTU on the VSM physical interfaces to match the ingress interface More Info: For better NAT44 performance, Cisco recommends keeping the default physical interface MTU This one is targetted to be fixed in 5.2.2 XR release NOTE 2: Be aware about default MTU for ServiceApp interfaces in 5.1.3 and 5.2.0: MTU is 1514 (not configurable) in 5.2.2: ServiceApp interface will be set by default to Jumbo frame size (not configurable) CSCuo63064 https://bst.cloudapps.cisco.com/bugsearch/bug/CSCuo63064 -Aaron _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
