I can source ping successfully from only a few of the SVIs on the switches. The successful SVIs are addressed 172.17.x.x. Others are 172.21.x.x. These fail. If it's any consolation, all of these segments are /22s.
I verify this by attempting to reach a host on the opposite side of a firewall. When ping is sourced from a 172.17.x.x, the attempts register in the firewall monitor. No such activity is logged when traffic is sourced from any of the other SVIs.
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