From 038de04d7b8af189ce142e7243b1ce14507c259d Mon Sep 17 00:00:00 2001
From: Russell Bryant <rbryant@redhat.com>
Date: Mon, 24 Mar 2025 09:30:41 -0400
Subject: [PATCH] Fix zmq IPv6 URL format error (#15341)

Signed-off-by: Russell Bryant <rbryant@redhat.com>
---
 vllm/distributed/device_communicators/shm_broadcast.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/vllm/distributed/device_communicators/shm_broadcast.py b/vllm/distributed/device_communicators/shm_broadcast.py
index 12a720d47fbba..842d9edfd1c55 100644
--- a/vllm/distributed/device_communicators/shm_broadcast.py
+++ b/vllm/distributed/device_communicators/shm_broadcast.py
@@ -233,6 +233,7 @@ class MessageQueue:
             if is_valid_ipv6_address(connect_ip):
                 self.remote_socket.setsockopt(IPV6, 1)
                 remote_addr_ipv6 = True
+                connect_ip = f"[{connect_ip}]"
             socket_addr = f"tcp://*:{remote_subscribe_port}"
             self.remote_socket.bind(socket_addr)
             remote_subscribe_addr = f"tcp://{connect_ip}:{remote_subscribe_port}"