Update readme and default flags for using execution-layer sync

README.md

@@ -153,8 +153,22 @@ $ op-node \
     --l2.jwt-secret=$JWT_SECRET_FILE \
     --network=op-mainnet \
     --rpc.addr=0.0.0.0 \
-    --rpc.port=9545
+    --rpc.port=9545 \
+    --l2.enginekind=erigon
 ```
+
+#### Execution Layer Syncing
+By default, op-node and op-erigon work together to derive every L2 block from the chain. However, this can take a while if the chain is large.
+
+Instead, you can use `execution-layer` syncmode on op-node to download L2 blocks from the peers in the network. 
+This will allow op-erigon to download and execute large number of blocks at once, resulting in a shorter sync time. 
+
+To enable execution layer syncing, set the following flags on op-node
+```bash
+    --syncmode=execution-layer \ 
+    --l2.enginekind=erigon
+```
+
 For more information for op-node, refer the [Optimism's node operator guide](https://community.optimism.io/docs/developers/bedrock/node-operator-guide/#configuring-op-node).
 
 ## Need any help?

cmd/utils/flags.go

@@ -1401,9 +1401,7 @@ func SetP2PConfig(ctx *cli.Context, cfg *p2p.Config, nodeName, datadir string, l
 		cfg.NoDiscovery = true
 	}
 
-	if ctx.IsSet(DiscoveryV5Flag.Name) {
-		cfg.DiscoveryV5 = ctx.Bool(DiscoveryV5Flag.Name)
-	}
+	cfg.DiscoveryV5 = ctx.Bool(DiscoveryV5Flag.Name)
 
 	if ctx.IsSet(MetricsEnabledFlag.Name) {
 		cfg.MetricsEnabled = ctx.Bool(MetricsEnabledFlag.Name)