The French authorities dismantled the southern half of the camp in February and March, but the number of migrants there has risen to between 7,000 to 9,000 people, straining relations between communities of migrants and between the migrants and local residents.

On Monday, French truck drivers and other protesters blocked traffic on the road leading to the port, and asked that the camp be razed. The French interior minister, Bernard Cazeneuve, who visited Calais last week, said the authorities would completely dismantle the camp, but did not say when.

The influx of migrants fleeing war, persecution or poverty has also affected Paris, where the mayor, Anne Hidalgo, detailed on Tuesday plans for this fall to open centers that would temporarily shelter and help migrants arriving in the French capital.

A center for single men, in northern Paris, will have room for up to 600 people; another in a southern suburb, for families, women and children, will have room for 350.

The city’s authorities have taken more than 15,000 migrants off the streets of Paris since June of last year, Ms. Hidalgo said, noting that there was a “link with what is going on in Calais” because some migrants were on their way there.

But Ms. Hidalgo has stressed that the centers in Paris would be temporary — they are being built on city land scheduled to be used for other projects in the coming years — and that the migrants were expected to spend only five to 10 days there for medical and administrative help.

“The first goal of this refugee camp is to shelter people until they are oriented toward state-run housing,” she said, referring to France’s dedicated housing for asylum seekers.

“If other temporary shelter centers have to be created,” they will be, she added.